A Shop You Can Trust -- Quality Work and Honest People I've dealt with GTR High Performance for many years, Gonzalo and Ricardo have always been stand‑up gentlemen. Even with how busy they are, they still take the time to understand your needs and make the right recommendations for your car. One thing to know is that good work takes time, and these guys don't rush anything. They stand behind everything they do, their pricing is competitive, and the quality speaks for itself. If you want honest advice, solid craftsmanship, and a shop that truly cares about its customers, give GTR High Performance a call. read more

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I heard this shop specialized in Mustangs so I decided to get my Mustang's suspension done at their shop. Lobby was cool, everyone's honest and friendly and knowledgeable about Mustangs in general. When I picked up my car and drove back home, they definitely did a good job, no clunky noises, car feels tight around corners and curves. Definitely will be coming back. read more

GTR High Performance - Before and after pictures of the wheel gap difference - Auto Repair Near Me - Rancho Cucamonga, California

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Friendly people and are really easy to work with. They are straight up and no bs!!! Really recommend to get your mustang checked out by them. read more

These guys are Mustang whisperers! I have known Ricardo and Gonzalo (GTR) since 2001. NEVER have I been disappointed. INTEGRITY is what I see when I see GTR! These are true friends of mine and couldn't want it any other way! From the bottom of my heart, thank you my friends GTR for your veridical honesty and FRIENDSHIP!!!! read more

GTR High Performance - 2007 Shelby GT500 - Auto Repair Near Me - Rancho Cucamonga, California

Gonzalo and Richard's are stand up guys that know their stuff with mustangs. Been going here for over 25 years. Unfortunately, I am a Mopar guy of late which is not their expertise, but would recommend any Ford person to them. Honest, value and experts on Mustangs! read more

I can't say enough good things about GTR High Performance! A couple months ago, I had an error code that kept popping up and after talking to FOUR different mechanics, no one could figure it out. GTR was the only shop that pinpointed the problem and replaced my shutter grille. The code never came back! More recently, my check engine light came on again. I thought it might be the purge valve since that's the most common code that showed up on my OBD2, but GTR checked it and confirmed it was just the purge valve solenoid causing the issue. They replaced it and my Mustang is running perfectly once again. What I appreciate most is their honesty -- they never try to upsell me or make things more complicated than they are. As a girl with a Mustang, that's rare! They've always been straightforward, trustworthy, and their work is top notch. 10/10 service every time. If you want a shop that actually knows what they're doing and won't rip you off, this is the place. read more

They do great work. For all your Mustang tuning and accessories. From regular service to performance upgrades

Impossible to get an appointment you just get left on read. Not going to beg for an appointment. Only way you're going to get an appointment is if you're family or you've known those boys for years. read more

This is a shop I can always trust and rely on for the maintenance of my Mustang with peace of mind. Having a trusted shop to rely on is a great blessing for someone who loves cars. read more

GTR High Performance - Auto Repair Near Me - Rancho Cucamonga, California

Took my GT500 here to have a Steeda Stop the Hop kit installed and also some dyno runs. These guys only work on Mustangs and really seem to know them inside and out, old and new. I recommend them if you have a Mustang. Will use them again even though I live about 45 minutes away. read more

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Have been to GTR High Performance Twice now, and they have been nothing been great. 2018 mustang GT with headers and intake, they installed no problem. They have helped me so much with my car. These guys have been in the game longer than I've been alive and I couldn't be more grateful for them. read more

If I could give this place negative stars I would. The way they left my car was horrible and honestly embarrassing. This was some crappy work that cost me a lot of money to repair. Never bring your mustangs here. read more

Found this shop on yelp and was planning to do my future mods w/ them. Gave them a try first, ordered lowering springs & clutch spring for my 19 mustang gt from them. Took a whole day for install and on my home had issues already (clanks and knocks on my front suspension). Also got charged for clutch spring installation w/c i installed myself, since they didn't have time for it. Reached back to them for my lowering springs issues but as always theyre booked and packed as I was told. So yeah, negative 1st exp. Won't go back. Hit or miss read more

I have dealt with this shop since 2020 and have heard nothing but a bunch of stories from these guys why something went wrong, they are unreliable, unresponsive to their customers you call and they leave you on hold for 30 mins or so, I might not have spend Tens of thousands of dollars at this shop but I spend my share of what I was asked to pay for work being done to my vehicle this shop made me buy parts I didn't even need because they couldn't diagnose a simple problem, they wasted my time and money that I'll never get back for a shop that's so good at oil changes it sucks to hear that you guys don't do half of your own work and outsource everything and charge double and have countless of times failed to provide good quality work. I am disappointed and hurt that you guys kept my vehicle for 2 months and didn't fix a thing to me and lied to me about working on my vehicle I drove home with breaks on a stretch of 50 miles and all you could say so sorry I hope your kids never experience what you have done to some of your customers karma comes around. If you are looking for quality work and does in a timely fashion I recommended gio's performance. read more

GTR High Performance - They did a check on my brakes and saw nothing wrong this is what I saw when I got home. - Auto Repair Near Me - Rancho Cucamonga, California

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Awesome experience with owners Ricardo and Dave. They took time out of their day to try and help me with my 91 ford check engine issues and were extremely patient and friendly thru out the process and refused to even take any monies for their time. Great group of people and recommend them to anyone needing help with their car read more

I made a call to inquire about bringing my truck to the shop and spoke to Angel. He's a top notch guy, super helpful and knowledgeable.

All I have to say is WOW. I drove down 3.5 hours from Central California to GTR High Performance to have some work done on my 2002 Roush Stage 2 Kenne Bell S/C. They came highly recommended by Kenne Bell which was conveniently located in the same area maybe a few blocks from each other. Upon arriving to GTR High Performance I was immediately met by Gonzalo and Ricardo (Brothers and Co-Owners of the shop) with smiles and open arms. I immediately felt welcome and a part of the family despite me not being a regular and out of town. They both were very respectful, caring, knowledgeable, and always willing to help. I have never been to a performance shop with such high regards for quality work, impeccable customer service, and strict deadlines. I would recommend their shop to any of my friends especially those with Mustangs. It's definitely worth the drive if you live out in town. I suggest you call them to plan accordingly. The stress of driving down and getting the work done to my car in a timely manner was immediately put to ease upon my arrival to GTR. If you're ever in the area I suggest you stop by and find out for yourselves. They are willing to work with you with almost any circumstances you may have. Work done: 3.73 Gears installed Spark Plugs changed 75mm Throttle Body installed MAF installed Chip updated for 3.73 Gears 2.5 days for install. Thank you again to you both and also your cousin Eli. Keep up the GREAT work. I hope to be seeing you guys again very soon. read more

GTR High Performance - 2002 Ford Mustang Roush Stage 2 Kenne Bell S/C - Auto Repair Near Me - Rancho Cucamonga, California

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Don't bother calling them. I had a supercharger installed 9n my car from Kenny bell. And they came recommended from Kenny bell to do other work i wanted to do. All three times I called they never had time for me. Ended up going to mpr motorsports. Spent 20k with them on all I wanted to do and had excellent customer service. Would recommend them to anyone. read more

First off let me say that the customer service was excellent, Ricardo and his team at gtr high performance was great they are very knowledgeable guys and can take care of any performance needs you may have for your mustang, I had suspension work done on my 2018 gt and the work was done the right way, I definitely recommend gtr to anyone looking for a performance shop with great customer service and excellent pricing. read more

GTR High Performance - Gtr high performance does it the right way. - Auto Repair Near Me - Rancho Cucamonga, California

This is simply on customer service! Thank you for not making me feel like an idiot for not knowing jack squat about super chargers lol. Awaiting quotes from a few options, definitely hope their work is as great as their customer service. Life-time member after that lol read more

Great place to take your mustang they know what they're doing. Ricardo was very helpful strongly recommend no cap

I found this spot on IG by sure accident but these cats took care of me took their time to explain things and helped me save a lot of paper! They installed my Roush axle-back and it's clean and sounds great! These are my go to cats for all my mustang mods and cosmetics. My next step will be suspension and these cats will be the ones to drop my 2014 Stanger! read more

GTR High Performance - Auto Repair Near Me - Rancho Cucamonga, California

Went in here for the first time with a friend just to ask a few questions these guys really know their stuff, extremely friendly gave us all the information with a great attitude I highly recommend these folks!! read more

Do not come here unless you want your car broken, the terrible customer service makes it even worse. Please do yourself a favor and run fast and far. read more

It doesn't get better than Ricardo and Gonzalo. I have been working with them for over 10 years from when they had a small one driveway car, all the way up to now with their 10,000 sq ft lot...and each and every step of the way they have been real, professional, honest and just plain old caring. They treat you like a person, not just a customer. They go the extra mile for you, emails, phone calls, diagnosis of car, etc. If you are a Mustang enthusiast and need some parts installed or your car checked, I would HIGHLY recommend GTR to you. I drive from West LA to Rancho Cucamonga just for this service, that's about an hour drive....WELL WORTH IT!!!!!!!! Additionally I must say I have had 2 Ford Mustangs and they have installed all the parts that I couldn't on each vehicle. One is my daily driver.....but the other is my Show and Go car that got the engine rebuilt, they installed the supercharger with intercooler, etc. I can't say enough about GTR, go there, you will love it, period. read more

Ricardo and Gonzalo are the best in the business! Both provide stellar customer service (and that's an understatement) and are extremely knowledgeable. I went in to have my car tuned (I came from a different shop that could not figure out why was car couldn't be tuned properly) and Ricardo was able to get down to core issues. Ricardo took the time to explain exactly what was wrong, why it was an issue and how to fix it. He was able to tune my car to be reliable on the street. I still need to return once I fix my exhaust leak to have it tuned properly. But that, of course, will be after I get my taxes!! This is definitely the best Mustang shop I have ever been to, and I've been to many! Go there! You will love it!! read more

Took my 1990 foxbody since I was having a little bit of trouble with my idle after building a new motor. Gonzalo was helpful at the front desk, quoted me for a new fuel pump and fuel regulator, installed in 2 days which was not bad for how many cars they have in the shop on a daily bases. Car runs great and way smoother with new parts and minor TPS adjustment. Will be returning in 2 weeks for some dyno runs. read more

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I just purchased a steeda tri ax short shifter for my '12 mustang gt. Definitely a lot better than the stock shifter. Overall quality is amazing and I have a hard time trusting performance shops so I did my research and found that this was the best choice. GTR high performance did an amazing job installing my short shifter! I'm definitely going back to this shop for more mods when it comes time. They do installations in a timely manner and I couldn't be more happy! Thank you for a great experience! read more

GTR High Performance - Getting my short shifter installed. - Auto Repair Near Me - Rancho Cucamonga, California

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I called Ricardo last minute I didn't have a mustang and he still made time to see me and put in my K&N intake. He did it in 1.5hrs and affordable labor. Great Job and immediate service. I highly recommend them read more

GTR High Performance - K&N dual intake! It's not a mustang but an infinity G37 and he still did the work for me. Thanks - Auto Repair Near Me - Rancho Cucamonga, California

I would warn anybody to not patronize these guys. They took over 15 months to rebuild my engine. They didn't respond to calls or texts in a timely fashion. I thought them fantastic when I had them put in my Kenne Bell supercharger. So much so I drove in from another state to have them exclusively work on my car. I'm not sure what happened but all of a sudden their work and customer service went to crap. I had them rebuild an automatic transmission only to have it break down driving it to New Mexico and found out they had cracked the case and tried to hide it with JB Weld without having the decency to tell me. It took them months ( over six ) to finally repair it and that was after telling me Ford did not make any new transmission cases for it ( I looked it up online and Ford did make new cases ). Ok I thought this was a fluke and I had several years of reliable service from them. When the transmission was fixed they told me I had a slight ticking noise in the engine I told them I did not want to take a chance and I wanted to rebuild the motor. I asked whether I should put a 5,0 Coyote motor or rebuild the engine I had with all forged internals. They said the better way to go was rebuild my motor and they had the perfect engine builder locally they had dealt with for years. So I followed their advice. Took them from August 2018 to Dec. 3, 2019 to get me my car back. They had the engine back from the shop that rebuilt it in March 2019 and it took them till now to get it in the car and running so it could pass a smog test. My registration expired during the year plus they had it and I could get the renewal with out a smog test that passed. March to Dec. 2019. Do yourself a favor and go elsewhere. A. J. read more

This is the mustang shop I always go to. Prices are reasonable and you receive quality work. They treat your car like their own and they know what they are doing. Look no further. read more

After countless hours of research, I sent an e-mail to GTR inquiring about suspension upgrades for my '14 Mustang. Ricardo responded to me promptly and was extremely patient and helpful in finding the perfect performance parts for my car. Ricardo's recommendations rang true with everything I had found on my online research. The shop price matched online retailers for the parts I wanted and their labor rates were reasonable. The in-shop experience was outstanding, as well. Gonzalo and Ricardo were extremely professional on the day of the install and Ricardo spent a while at the end of the day discussing options for my pending supercharger install, which will certainly be done at their shop. I absolutely love my new suspension set up. I live in San Diego, but after briefly dealing with the big name performance shop in my area, I will be taking my car up the road to GTR. Thanks, guys!!! read more

Excellent shop! World famous, sorta. I have been reading about this place in 5.0 Mustang and Super Fords for a long time. I have friends who have used them. I finally got to visit them and have a set of Maximum Motorsports subframe connectors installed. I made an appointment for a Saturday. The work was excellent. My 1994 Cobra is now ready for some serious front suspension work! Can't wait to get my car back there. read more

These brothers are fantastic and honest. They are upfront and do clean quality work. They have really good attitudes. The shop is clean and professional. They installed a set of headers on my Stang. Be patient; this shop gets really busy with phone calls. They take their time when talking and explaining things even over the phone. read more

This is the best shop in California and probably in the country. I been coming here for the last 6 years and they always do great work.

These guys know mustangs ! These guys give you A class service without killing your wallet. They installed a kenne bell supercharger on my 2012 mustang 5.0, and man is this thing rocking ! On fire ! 510 hp to the rear wheel! That's what I'm talking about ! And no bull ! There in house dyno says it all. Only Ricardo and Gonzalo can touch my baby. If you got a Stang this is the place to bring it ! read more

Very cool shop that is a big part of the car community. Everyone who works here has the ideal personality when working with their customers and you can trust that they will take care of your car like it's there own. A true example of what a great shop is. This is the kind of shop that should be on TV. read more

I was dissapointed by the way I was treated after trying to set up an appointment. Twice they cancelled on me and only because they had a magazine that was there shooting. That tells you they rather leave an unhappy customer only to be put in a cover of a magazine. Won't do any business there. read more

Came here to get my S197 done up and Gonzalo, Ricardo, Elie are freaking awesome. They installed my Vortech SUpercharger, ceramic coated headers, short shifter, etc. And the car runs grrrrreat! They also have an in house Dyno so you can see what kind of numbers you are putting out. They dont try to sell you things you dont need just to make a quick buck and they make you feel at home. All of them are ASE certified so you know they know the game. And they are always readily available to answer any questions you may throw at them. Gonna bring the '10 Mustang here as well when I get it come next summer... read more

I love these guys. They do excellent work on any Mustang, any year! Gonzalo, Ricardo, Chris, Elie are all good at working on my Cobra!