First-time Audi owner... and I wanted to get an exhaust installed along with a new splitter and diffuser. I told Nick I was completely new to the world of modifying cars, especially Audis, and he couldn't have been more helpful. He took the time to walk me through my options, explain everything clearly, and help me choose what made sense for my setup and goals. The communication throughout the process was top-notch. While my car was in the shop, they kept me in the loop with progress updates and photos, which I really appreciated. When I picked it up, the splitter and diffuser looked phenomenal, and the exhaust sounded exactly how I wanted it to... deep, clean, and not over the top. I'll definitely be coming back to AU Tuning as I keep exploring the tuning world. Highly recommend these guys if you're looking for honest advice, great work, and solid communication. read more

Auto Union Tuning is amazing! They specialize in Porsche, Audi and VW, however I brought them my Kia Stinger and they did a great job. I originally brought in for an oil change. As part of their service they did a full inspection. They found some other things that they recommended I have done. There was no pressure whatsoever from them to get these things done. He even googled to see if some of the items were covered by my warranty and recommended I check with the dealer first before paying them to do the work. They use a really cool software that sends you pictures and a breakdown of each item with notes and costs. If you are thinking of going to them... DO IT! I will always bring them my cars. A+++ read more

Auto Union Tuning - Auto Parts & Supplies Near Me - Placentia, California

I have been going to AU Tuning for past 8 years, and I fully trust my service needs with Raz and his techs for my service needs. He not only an expert for my 2014 Audi S4 but I also trust him to work on my other vehicles i.e. Ford. He is GREAT at troubleshooting complex issues, and you can trust AU Tuning to do the right thing for you EVERY Time. read more

I've been a customer of Auto Union since May 2024. My friend recommended them, and I'm so glad he did. They're incredibly attentive to my MK8 R, providing all the necessary maintenance at a better price than the dealership. They tuned my car, and it's been running like a dream ever since. I drive from Los Angeles to this place! I couldn't be happier with my car shop! read more

Auto Union Tuning - MK8 Golf R - Auto Parts & Supplies Near Me - Placentia, California

12 years and multiple cars later, still the best in the business. Huge thanks to Raz and his technicians for the amazing transformation on my 2026 RS3. From the intake whistle to the exhaust roar to the 034 Camster mount precision, this build is officially pristine. They caught a minor suspension noise on the test drive and fixed it before I even arrived for pickup--that's the AU Tuning difference. If you're in OC and have an Audi/VW/Porsche, this is your home court. read more

Ive been here many times and trust me these guys know what they're talking about. From engine work to the suspension and even getting the right tune. Best shop I've been to and the only shop i go for all of my cars needs. The inside is clean and service writers are always very patient and knowledgeable. They always show love and give compliments on my car. As a paying customer i really appreciate the level of detail they put into every install. For your VAG needs come to AU Tuning. Shoutout to Nick for always being an email, call or text away! read more

Auto Union Tuning - 17' Passat Rline - Auto Parts & Supplies Near Me - Placentia, California

They have done many services for my Golf R. From Haldex fluid changes, alignments to suspension installs. The Bilstein B6 Damptronics (DCC) I got from them are perfect. They document all of their work and even update Carfax service records. You can even get pictures of your intake manifold after doing a carbon clean (walnut blasting). Been to many shops and tuners in the past (with my S2000s even) and this place is top notch. Nick helps me out every time. read more

We found this shop by word of mouth in our community. We took my son's GTI there to have it repaired and the shop exceeded my expectations. They were professional and Nick communicated throughout the entire process. Shop was clean and you can tell they pride in their work. They were very thorough and the prices were good! We will definitely go back if we ever need any of our cars repaired! read more

Auto Union Tuning - Auto Parts & Supplies Near Me - Placentia, California

AU Tuning has been the best shop I've taken my car to--period. They've performed nearly every imaginable service on my B7 S4, and I've never once felt disappointed or questioned the value of what I was being charged. The team treats the car like it's their own, and communication is consistently professional and clear, whether I'm speaking to Nick, Raz, or anyone else on the phone. The only issue I can think of is one time, they forgot to reconnect the horn after a service. I called the next morning, brought the car in, and they resolved it within 30 minutes--free of charge. What really sets them apart is their understanding and transparency. They are extremely understanding that in my case, my B7 S4 is a money pit and they've never pressured me into unnecessary work. They've even suggested used parts or more affordable solutions when appropriate. Highly recommended if you want honest, knowledgeable people working on your car. read more

What a great experience! I showed up a bit early and was greeted with smiles. Met a long time customer of theirs and he raved he's been working with Auto Union Tuning for 10 years! Nick was amazing. Very professional and thorough and patient. Explained everything to me. In a matter of 30 minutes or so they did a Cobb tune on my Porsche Macan GTS and now it's even more amazing. Nick took the time to explain how to use my Cobb Accessport. I highly recommend these guys. 5 star service. Thanks again Auto Union Tuning! read more

First time customer and very satisfied with work performed; fair prices and quality work. Interacted with both Raz and Nick. Both professional, excellent listeners and communicators. Found myself a new mechanic. read more

Raz over at AU Tuning is the best! Everyone at the shop goes above and beyond every time I'm in. I have enjoyed many years of excellent service and looking forward to many to come. read more

Top-notch service and communication from this place. I purchased a Golf R earlier this year and finding a specialist shop to take care of my vehicle was a priority. I went with AU tuning due to their years in this business and the work they put into VW and Audi vehicles. Starting with communication, this place communicates highly efficiently. While emailing Raz and Nick, whether for maintenance, fixing an issue, or even finding me the parts I want. Their communication skills never missed a beat. I had them complete the 30k service on my Golf R here and I really liked that they took their time to document everything, at the end I got pictures confirming all the work they did and even pictures confirming the transmission leak from previous paperwork I received. I recently got a Remus exhaust installed here and they worked with me to get the parts from their suppliers. With confidence, I can say this is my home shop for my Golf R and I wanted to thank the team over at AU Tuning for all of the work they put in. read more

Auto Union Tuning - Remus exhaust for Golf R - Auto Parts & Supplies Near Me - Placentia, California

The team at AU Tuning is always reliable and professional. It's a good knowing I never have to worry about timing or the quality of work, they're always on top of everything and deliver excellent results every time. read more

These guys are top notch. Honest, reliable service at a reasonable cost. I have been going to them for years, and have never been disappointed by their work. read more

This place is fire! Very knowledgeable people and great customer service I definitely recommend :)

I had the pleasure of doing equipment repairs. That AUT knows they could of done themselves. But chose to give me and my experience the work. What a good decision. I was happy to have the work too. I made contact with three AUT personnel and all three representatives left me thinking I wished they worked for me. RAZ was generous, paid me fairly and promptly. I see, Auto Union Tuning is that shop, the one good secret, you don't want to tell anyone about, due to longer lines and wait times, if you do tell. So I will do it. Give these guys a call, you won't be sorry. Thank guys, by the way we also repair and service car lifts. read more

Absolutely hands-down the best mechanic in town! Kudos to Raz and Dave for taking care of my car for all these years. This review is long overdue, I've been coming to this mechanic shop for many many years. Starting probably close to 10 years ago with my Porsche. Then after I traded that car in I got an Audi which I continued to bring in to Raz. I am glad that they moved to North County from Lake Forest. Their new shop is humongous, and very nice. Over the years they have fix numerous problems on my German imports. Their prices are very reasonable, and they do high-quality work, and they test everything they do multiple times to ensure that their repairs was done correctly and your car is reliable. I trust them 100%. They can fix even the most difficult issues. I had my back up camera that stopped working, I took it first to an audio video accessory place and they troubleshoot it for a long time and couldn't find the problem. Raz and Dave Took their time and really dug in deeper to diagnose the problem. And didn't even charge me an arm and a leg to fix it. Now my back up camera is working again which made me super happy. Also these guys are super Duper knowledgeable and they can fix basically everything. And of course they're super Duper honest and always try to help the customer save money! Major kudos, and highly recommend! read more

Was planning on towing my car here and called for a quick video diagnosis which I sent over to Nick from AU. He wrongfully diagnosed my car and made me lose all trust. Here is the video I sent over, clearly showing when the clutch is compressed there is no noise of rod knock. Any expert tuner should know right away when you compress the clutch and the noise goes away, it is not rod knock. read more

These guys are incredible. I have been going to Raz and Dave at AU Tuning for over a decade, through multiple cars starting back when I was a teenager coming in with a limp-mode 20th AE GTI to now. They were total pros and knew exactly what was wrong getting me back on the road same day. It's extremely rare to find a shop who's owners are still hands-on and maintain their legacy of professionalism and quality through their exponential growth and notoriety over the years. For years I have been recommending AU Tuning to my friends and family and stand by the quality of work they do to a near-religious extent. The shop has moved and so have I over the years, but I still take a 2 hour round trip specifically to continue going here. I have moved into many different platforms from B5 S4s, JCW Mini's, Porsche's, Mercedes' and now my Supercharged Mustang, and they still find ways to take care of me no matter the car. Joe has been taking care of my Mustang and knows the platform just as well as any of the V.A.G. cars they typically work on. Joe has been incredibly knowledgeable and services my car with fantastic attention to detail, keeping me updated every step of the way. I especially appreciate the SitRep he gives me on the car as it's a heavily modified track car and he genuinely wants to make sure it's at 110% every time it passes through his hands. I can't praise or thank these guys enough, and look forward to the next 10+ years of working together! read more

Auto Union Tuning - 2016 Supercharged Mustang GT on E85 - Auto Parts & Supplies Near Me - Placentia, California

Seamless. Very professional and my Q5 handles like a dream. It's true the real hiden gems are ones that find you. The team wa great. Customer for life. Thank you!! read more

Came here for charcoal filter removal and new rims. Both done in timely professional manner. They kept me updated constantly on status. Will come back for any tuning related items, great guys! Btw, she drives like a champ! Thanks again! read more

Auto Union Tuning - New rims m5 - Auto Parts & Supplies Near Me - Placentia, California

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Great shop! VW dealership wiped my APR tune when they flashed my ECU as part of a recall. The shop that originally tuned my Passat 4 years ago wanted $150 to re-flash the tune. Called around and AU Tuning quoted me $55 for the same work. Drove down with no appointment and they did it in an hour as a walk in. Will likely be swapping the Passat for a new GTI in the very near future and you can bet that I'll be going here to tune the new car. read more

Took my bmw x5 in to install stealth hitch. I got a few quotes and Au tuning was the cheapest. They were fast and responsive to my questions. Scheduling was fast and easy. Took less than 5 days to get the hitch from stealth hitch and installed in 4 hours. Nick was great. read more

Auto Union Tuning - Hitch attached. - Auto Parts & Supplies Near Me - Placentia, California

Raz and his crew should be the go to shop for any German automotive needs. From maintenance, upgrades, to general questions they have helped me along the way. From the time I went apr stage 1 with them 2 years ago I knew this was the only place I'd take my VW. Two years later, and now at 520whp and ~4XXtq for over a year of reliable daily driving I have to say I'm nothing short of the service I've received. Dave knows the 2.0t better than most any of the other tuners and all of the remote tuners. The mechanics are always honest and quick to identify the issue. If you care about your car, take it to oc for 5 star service. Thank you guys. read more

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Huge thank you to the team over at AU. Raz and Dave helped me so much and were open and honest with the whole process along the way. Taking every vehicle I get to these guys from now on. Thank you for getting me back on the road. read more

Nick in the front was courteous and knowledgeable. Got my problem solved without upselling. The place to go.

I've been a happy customer at AU Tuning for many years - the only team that I trust with my Mk6 GTI. Finding a good, honest mechanic is insanely difficult - Raz, Nick and the rest of the team have taken care of me for over 5 years! They've earned my loyalty as a happy customer, I've followed them around to all their OC locations. The experience is always pleasant, efficient and they do amazing work and with fair pricing. read more

After bringing in my car for a simple oil change a couple of months ago, I was back for a complete front brake job, coolant flush and a change of spark plugs. The guys had me in and out in under 1.5hrs. I'm pretty sure the car would still be in the service line at the dealership. Thanks AU! read more

Nick was amazing at communication and and getting my appointment scheduled. Jimmy, the alignment tech I spoke with was excellent at identifying the issue with my car and dialed the car in perfectly - he's an alignment master! It's clear that everyone here treats their customer's cars like their own. If you need an alignment, you need to come here and ask for Jimmy to work his magic on your car! read more

I have a 2016 Volkswagen Jetta GLI with just about 70,500 miles and I went in to AU tuning to get my breaks flushed because it's been 2 years sense i last had it done and i also had a soft break pedal. I gave them a call earlier in the week and made the appointment for Saturday morning. When i showed up they were busy which is a great thing and a good sign to me in terms of business! I visited their old shop in lake forest years ago but this is my first time at their shop in Placentia and man the shop in Placentia is very dialed in in terms of getting things done! I can't help to commend Nick who was very thorough and to the point of what needs to get done. My breaks feel brand new with just a break fluid flush and I will be coming back for any other break jobs or any other big repairs that I can't do with out the help of their skilled mechanics! (I will also bring Audi's that i will have in the future!) Keep in mind I am driving from San Clemente and they earned my trust and I am a loyal customer to AU tuning for many years to come! thank you guys! read more

Auto Union Tuning - This is my baby! 2016 Volkswagen Jetta GLI! - Auto Parts & Supplies Near Me - Placentia, California

Long story short: If you have an R8, take it to Raz @ OC Tuning. My AC compressor died on me, which is a very common issue with Gen 1 V8 R8's. I had asked around literally every Audi dealer in SoCal for quotes, and they all asked for $7k - $9k as they say this job requires taking the engine out. I switched gears to indy shops, and most either didn't want to do the job or didn't get back to me. I dealt with a SoCal summer without AC + pandemic, so the R8 wasn't driven much at all. A friend recommended OC Tuning / AU Tuning for a couple of different jobs on the R8, and the impression I got was that Raz was very knowledgeable about the R8 and its foibles. Lo and behold, their quote was much, much more palatable that I said yes on the spot. My experience with OC Tuning couldn't be more positive - my car ended up at the shop for a good while - I was getting a couple of other jobs done to the car + dealing with a third party tuner which took up the majority of the time. Throughout the whole thing Raz was super communicative and let me know what was going on. The R8 now runs better than ever and I have an ice-cold AC again. Thanks Raz & team! read more

Brought my 2017 Audi S3 here for an APR Stage 1 tune. Nick and I communicated over email from an inquiry I made and from the very start he has top notch customer service skills! Quoted me the service and even got me in a day earlier than I had requested to complete the work. Very happy with the results and will definitely be back for some additional work. Check these guys out...super friendly for first time or regulars of the shop. Thanks Nick! read more

I am SO PLEASED to find OC Tuning has opened up their shop in South OC. OC Tuning is an extension of AUTuning in Huntington Beach, which I frequented for service for our VW and Audii for many years. The owners there, Raz and Dave, and their techs know their stuff, and are very forthright and honest in their assessments of my cars. They tell me about my cars what really needs attention, and what can wait to do later. Their prices were fair, and service was timely. But then I moved to So County and wondered how I'm going to find a similar mechanic down here. So when OCTuning opened with Raz at the helm in Lake Forest, I was stoked. I brought in our Audi, and Raz and team did a perfect job. It's a clean shop, has a small waiting area with TV and internet. The shop is legit , but more importantly the people that run it are extremely legit. I'm going to start bringing in my Toyota for my service now. Welcome to the neighborhood! read more

Raz is the man! Got me in an out for an oil change on my cayenne diesel. Had no idea this was the same crew from AU Tuning, they had done great work on a clutch swap once I had burned up the original on my '11 a5. Definitely using octuning whenever I'm in oc read more

Brought the NSX in for Dave to change the brakes, fix the window regulator and maintenance took care all of that for me. Thank you for your help happy with the quick service read more

Auto Union Tuning - NSX maintenance done - Auto Parts & Supplies Near Me - Placentia, California

Brought in my BMW for a Dinan ECU Tune. By far the best customer service and communication from a performance shop I have ever experienced. Special thanks to RAZ for going above and beyond in assisting me from start to finish with my vehicle. I highly recommend this shop, they know what they are doing, and they really care about their customers. read more

This place is a true gem. I've been taking my MK6 GTI to AU Tuning and OC Tuning since I first owned it almost 5 years ago and would never go anywhere else. Raz and crew know VW and Audi vehicles inside and out. There are no gimmicks or selling of extra services. The staff are very knowledgeable car enthusiasts and take care of your car like it's their own. I've had small jobs like brakes and oil changes to large jobs like a turbo replacement, coilover install, carbon cleaning, and timing chain tensioner replacement done here and have never left less than happy. All of their work is top notch and they take the time to explain what they are doing and why. To sum it up, great honest work done by awesome people. read more

Mad respect to Raz and Nick for installing my problematic, indie shop coilovers! The fact that they even considered installing my coilovers is a plus, not like the other major ocean "German" shop who basically undermined it and pushed me away as a customer. I guess they can afford to lose customer a forever. Anyways, installing the coilovers was definitely a nightmare and OC Tuning still powered through it. I definitely recommend them because not only they what they're doing, but they also welcome new customers whatever unknown parts we may have. read more

Auto Union Tuning - Dropped B9 A4. - Auto Parts & Supplies Near Me - Placentia, California

AU Tuning is my go to trusted shop for maintenance to mods. Enthusiast owners and certified mechanics who are professional, responsive, and always happy to help. Highly recommended! Worth the drive no matter where you are in LA county. read more