If you are looking for a legitimate custom tune for your car, I highly recommend Church Automotive Testing. I had my 2015 Subaru STI tuned on flex fuel by both Shawn Church and Ryan Miller and let me tell you, my car runs flawless! Shawn has been tuning cars of all platforms since 2002 and it is very evident when you speak with him. Aside from being an expert at what he does, he is humble in his approach and takes the time to explain things to you. Both Shawn and Ryan have earned my trust and business. I will be paying them a visit in the near future once I am ready to instal a bigger turbo on the STI. read more

Shawn tuned my car in 45 minutes to an hour. Guaranteed his work. My car has never run so smooth and she's fast as .... This guy is not only a diabolical genius he's modest and his price is fair (I would have paid more!) thank you Shawn. Johnny with the gray Cadillac CTS V 700 HP read more

This is the second time I've taken a car I've taken to Sean Church to work his magic. The first time i met him was about 15 years ago, when I put a turbo on my Honda Civic del Sol VTEC and heard about a piggyback system called Hondata, which would allow you to remap the ECU and tune it for whatever modifications you installed. Hondata's own project cars were getting tuned at a place called Church Automotive Tech, so that's where I went. Sean and his crew were super accommodating and I left with a Hondata s300 installed and a custom tune that was worlds better than the FMU that formerly fed my thirsty OBD1 B16A3. Many years (and cars) later I wanted something to tinker with, so I picked up an LS1-equipped Trans Am with twice the cylinders (a V8) and a centrifugal charger equipped for breathing duties. It had been tuned once...but it never ran right, feeling sluggish and laggy and backfiring whenever I punched it. I upgraded the fuel system and the pulley on the supercharger and then called around looking for someone to dyno tune it. Eventually, I decided that Church was the place to go. I showed up a little early and they took me in right at the time of my appointment. There are several tuners there and I've heard they're all great, but Sean Church himself took care of my ride. Despite having to jump-start my battery that decided to give up right then and there, everything else ran smoothly. Sean showed me the fuel tables and explained why the car felt sluggish and backfired constantly (it was running way too rich and the timing was pulled across the board), and then began adjusting the tune in between dyno pulls. After he was satisfied, he detached everything and then rode with me around the block, monitoring the car and fine-tuning it on the fly. Let me tell you, it felt like a brand new car! The backfiring and hesitation were replaced by a healthy roar, and the car pulled smoothly and quickly to redline. Sean Church and his crew are friendly and professional and masters of their craft. I have nothing but praise for them, and heartily recommend them whether you like import tuners or American muscle! read more

See all

Shawn's reviews speak for urself. But man is a humble man, with experience and very polite. I know majority of tuner can barely form proper words because of so much ego. Not only he tuned my car Great, he took every single thought I had when it came to throttle response and tuned to to my linking, I am a bit precise when it comes to throttle and feel of the car and Shawn def delivered. Very attentive and won't leave u with questions, I would recommend. TUNED 2021 WRX on Cobb tuner. read more

If you need your engine custom tuned Shawn and his crew can help. I brought my 1969 GTO with a Holley Sniper aftermarket fuel injection system and they got the car running right. Starts right up, Udells as it should and no more stalls. Very happy with my car now. read more

10/10 these guys hooked me up and took care of me. Some issues were brought up based on the install, I was stressed but they handled it for good price as well. My new shop to go to now read more

Daniel here at Church's saved my Honda CR-Z! Local Honda dealership overwrote my tune when going in for service and Daniel was able to add it back using my Hondata FlashPro. Other tuners were afraid to take the car because it's a hybrid CVT. Car feels better than ever! Very fair pricing. There were cars here worth 10x more than my Honda they were working on at the shop. I was referred to them directly from the Hondata rep to go to fix my vehicle. They are the real deal. Thank you!! read more

My turn. Why does the Mister get to have all the fun? A little history. We have an older weekend car. It's not a daily driver. Every time he swaps the motor we have to bring it here so Shawn can tune it. It's kind of pricey but he does excellent work. We also have had several private Nissan events here where all participants pay a flat fee to test their horse power. Well I bought myself my own little gem. Not a Nissan but a Honda. We made friends with Hondata who wanted to team up and do a Honda event here. We purchased the Flash Pro to increase my cars horsepower, filled the tank with 100 octane and were curious about the numbers. We invited a few people with the same car who were also curious about HP. Our participates each received 3 Dyno pulls. Located in a place called Wilmington. Where's Wilmington? Well it's a very industrial part of town off the 405 where are those oil riggers are and terminal island. Not a whole lot happening in this area. Very little places to eat. There is an ice cream man though. Listen for him. Private events are great. Usually it's a set price for each participant. If you need a custom tune Shawn is an expert. He knows his cars. read more

See all

Definitely recommend them for you tune no issues whatsoever thank you guys once again

Thank you to Shawn Church and his crew for fine tuning my g37 today. We got gains of 20hp and 22 ftlb, with an impressive 40 hp gain in the midrange. Shawn said this was one of , if not the biggest jumps he's seen in a car like mine. he mapped me 5 different settings- normal, economy, aggressive pops/exhaust flares, valet mode and anti theft mode. I found these guys online, and checked with my local tuner expert mechanic who also highly recommended them. made an appointment the day before, took about 2 hours and then Shawn did a test drive with me after to make sure I was happy with it. would definitely recommend em! read more

Church Automotive Testing - uprev tune for my g37 - Auto Repair Near Me - Wilmington, California

Took my Civic here for a tune this morning. I haven't been here in 3 years but this place hasn't changed much. Always nice cars here and the guys know what they're doing. Daniel tuned my car, super chill guy. Realized when I got home I was missing one of my lug nuts. I got extras so it's all good. I'll probably be back real soon for a retune, got some more mods coming in. Can't wait to come back! read more

Church Automotive Testing - Ready for my tune! - Auto Repair Near Me - Wilmington, California

Took my Subaru sti for a 400 whp bump , didn't want to leave a review just yet wanted to wait a couple months and see how the car behaved , happy to say that I've had 0 issues and happy to know I found a reliable shop that I can trust ask for Sean he's a man with knowledge read more

See all

Sean's the best. Brought in an outdated old Mapecu3 and he was able to deal with how slow and finicky it was. He was understanding and helpful with my situation. read more

Today I was honored to have my car tuned by none-other than Mr. Church himself. I drive a 2010 Mazdaspeed 3 and have been waiting a long time to have my car properly tuned. All I can say is: "SMILES" and a lot of it. Shawn Church is humble, honest and overall knowledgeable. I can't thank him enough for safely tuning my car so I have a more enjoyable driving experience. read more

Great experience here. I had to bring my car back a second time when Shawn discovered boost creep on the dyno. I had it taken care of and came back for a retune. I had to pay extra as I was unaware and it was my fault. I just want to say in response to that recent 1 star guy that's trying to sling mud just to recommend his buddy's shop. As it has been clearly explained to every single person that went to Shawn's, that this is a tuning shop, not a repair shop. If your car has issues and won't run properly, it's actually your responsibility as the owner to take care of them prior to the tune. If the issue is discovered on the dyno, you are going to be charged lol. Don't waste everybody's time. Get your car checked out before bringing it to a tuning shop, you are responsible for your car's condition, not the tuning shop. So instead of blaming everyone for your car's issues, maybe get it checked out first? read more

Not sure what all the rave reviews are for here. If you like rude/arrogant staff, being spoken down to, a terrible tune/service, and feeling like these guys just want your money, cool - go here. They don't care about you or your vehicle. Had to do two sessions here after wiring was burnt the first time... was that their fault? Not sure but felt like an oversight for sure - a quick look in the engine bay could've seen the risk. Second time back charged me another remount fee (which I wasn't told about). When done, I was grunted at to look at the monitor for results, with no explanation or walk through of what they did. Idle was still very high, they refused to adjust the screw, hacked the air flow down and couldn't get me out of there quicker. Shawn was nowhere to be found conveniently. First drive on the road and car didn't shift at all. Later found out the transmission wasn't even connected. How did that not come up?! What were they actually doing and charging me $600 for?! Went to Izzy Performance instead. Totally different experience. The team there are good humans who actually take the time to look at what's going on, make recommendations, and work through problems/solutions with you. I could list all the errors they picked up (and fixed) but the car is a totally different drive now (for the better). And it shifts. Church was a total waste of time and money. Absolute scumbags. read more

Great experience, although my WRX wasn't up to par to get it properly into Stage 2+ -- overall good experience although I do feel that when going there, the vibe is kind of stale and if you don't know them or anyone there personally, your just another customer/job for them. Would recommend though if you're trying to get your whip tuned up. read more

Great place and easy to work with. I was recommended to come here from basically anyone I ask and after going I can see why. Take your car here read more

Shawn tuned my Subaru, he did an amazing job. The car made 750hp, I never had an issue. It performed well as a daily driver. Shawn is a true professional, I'm very happy with his work. read more

The best All i can say ...I could not find not one other shop to tune my car and I must say I'm super happy

I've been here 4 times now and I recommend it to everyone that asks me about tuning! Shawn, Henry, Daniel and Ryan are all great guys who know their stuff! Henry took care of my subie like it was his own! My car is a pain in the ass to tune because it's a automatic Subaru (4Eat) and has a good amount of modifications but Henry really put in the time, work, and his experience and I couldn't be happier!! Looking forward to going back once I have that sweet 6 speed swap (someday!) thanks again to the whole team! read more

See all

Could not be happier with my results. I took my 1971 Chevy K5 Blazer in for a tune a couple weeks ago. After I upgraded to an Holley Sniper EFI system, I needed it to be properly tuned. This place was highly recommended to me by several trusted people in my circle. After experiencing the knowledgeable and professional service by Mr. Church and staff for myself, I will not take my truck anywhere else. Thank you guys!!! read more

Had my 14 Wrx tuned here today. Was very pleased with the Pro tune Daniel made for me. He is a true profesional. Car runs amazing and no longer has boost creep issues. Made 318hp and 344 ft lbs . It gets very loud in the shop when they are running the cars. Ear plugs would be a great idea if you are going to be waiting in the shop while they tune. There were a couple chairs in the shop to sit down while you wait. I didn't go any farther in the shop, so I don't know if there is a waiting room. This is in an industrial area, so there are no shops close by for food or drink. Also, the roads around here are very rough, so if you have a lowered car, beware. The crazy semi drivers don't seem to care as they are driving full speed ahead. Bottom line is I would not hesitate to recommend this shop to anyone. read more

Church Automotive Testing - Pro tune by Daniel. Amazing. 14 WRX 318awhp\344awtq - Auto Repair Near Me - Wilmington, California

See all

Thanks for your help advice over the phone. Bolted up the heads that were milled .030" and will run e85 in the future. read more

Church Automotive Testing - Heads - Auto Repair Near Me - Wilmington, California

Shawn is the man! Such a cool guy, I went in to tune my corvette. I couldn't be happier, and thankful for his guidance.

Daniel, an auto tuning tech handled my issue with my car and a check engine light. He was very skilled and proficient with the K-TUNER programming and got rid of the check engine light at a very smart price of dollars. read more

I was recommended by my partner at our shop since we do high performance mods installs but no tune and other services like vehicle custom wraps. Made an appointment at 10am and sure enough it was done when they 2 hours. My Memphis Belle 1LE SS Camaro came in with cats delete and cold air intake so that I can maximize to its fullest and I was truly impressed why I got .y car back Church did a great job of making it lean, mean and track machine which increase my WHP read more

Church Automotive Testing - State of the art tuning..... - Auto Repair Near Me - Wilmington, California

See all

Thank you Sean! I showed up with my AHP buit C6 Z06 which developed very rough idle issue. In a matter of minutes Sean diagnosed and tuned. He took the time to explain the cause and fix. Sean came highly recommend and I know why. Thank you again. read more

Church Automotive Testing - Auto Repair Near Me - Wilmington, California

Fast, Knowledgeable, Professional, are a few of the quality traits Will definitely always recommend and take my car to them. I drove almost 3 Hours each way to get my tune done there. After trying a couple other shops and options. Surpassed my expectations. read more

Church Automotive Testing - Tuning my 2009 Acura TSX with CT-Engineering Super charger, bolt ons and Flash pro - Auto Repair Near Me - Wilmington, California

See all

I'm starting to think people were paid to leave good reviews on this shit because the younger dude that works here is a POS, the worst customer service I have EVER received is from this place, the actual owner that does the tuning in the LS engines is a good and nice guy to deal with but slimy tune still was not even equal to a base tune that I received from Cunningham Motorsports. If you want a good tune and for your HP car to work correctly, save yourselves the headache and go see izzy performance. read more

Church automotive tuning is definitely one of the best tuning services out here in Southern California. Shawn Church, the owner, did a wonderful job at tuning my car and was very friendly. Definitely coming back for future tunes! read more

Church Automotive Testing - Auto Repair Near Me - Wilmington, California

Came in to get a flex fuel kit installed. Ran into an issue due to a faulty fuel line caused on my end but Ryan was more than helpful and went above and beyond to help me make a custom line to make sure I got that kit installed. Installation was perfect, my car is now running on E85 and I couldn't be happier with the service I received today. Thank you Ryan and Church Automotive! read more

Church Automotive is the place to get your DODGE tuning done. Before I went to see Shawn I went to other several places to get my tuning done for my 2012 DODGE RAM 1500 after I installed a ProCharger and they couldn't give good results everything was going wrong with my trucks performance until I got to Church Automotive, Shawn and Ryan saved my life now I drive my truck with more confidence. Thank you guys keep up the good work! I highly recommend Church Automotive for you tuning needs! read more

See all

Shaun did a great job in tuning my vortech supercharged g35. Last year I went to so cal to have a good friend of mine install my vortech. After the install was done, I took it to church's to have it tuned the following day. Shaun was great in answering all my questions. The g35 was tuned more for street since it was still on a stock block and still had cats as well. The car ran great even in the 90+ degree weather. I will be coming back soon since I plan to do more power mods in the near future. Thanks Shaun! read more

Super happy with my first round of results! I put on quite a few bolt ons and such before getting tuned to get the max out of my first visit and it was 100% worth it. Sean was able to get me an extra 32 lbs of torque and 31 hp. I'll definitely be back after another round of mods. Sean was really nice when it came to questions and pointers on what would help improving performance as well, thank you again! read more

Great experience working with the owner, who helped my assistant get my wife's Jeep tuned exactly how we wanted it with a smooth power band, daily drive-able and nice top end power. They clearly know what they are doing at this shop and I appreciate their good communication and service guarantee. read more

Let me first say that this isn't your normal tuner!!! They are actually nice here!!! I have been to Churches twice now and will never go to another tuner again!!! My first tune was done by another shop, I won't name names, buy it rhymes with Simi floater sports. They were complete jerks and treated me like I was a huge bother, even though I was spending around 5k there. Well at Churches it is a complete different story. They are the nicest guys around and really take the time to do a good safe tune. If you are looking for HUGE numbers this is not the place to go. But if you are looking for great numbers and reliability, then Churches can not be beat. So they start by taking off all 4 wheels(I have an STI) so it's all wheel drive. The they spend a good 2-3 hours tuning your vehicle. After they are done guy go one a 20 minute ride with the tuner still making adjustments while you are driving, I couldn't believe it. All the while the customer service can not be beat. Sean, who is the owner is a stand up guy and will do his best to make sure your tune is up to par. Just by seeing all the cars there and the wait time to get an appointment tells me that this is the place to go. CHURCHES has earned my business for Life!!!! read more

Church Automotive Testing - My STI getting ready for tune!!! - Auto Repair Near Me - Wilmington, California

For those who don't like to read - great service, great prices, very knowledgable staff. I made an appt with Shawn about 1 month ago on a project vehicle. We had a little hiccup and the tuning device needed to be picked up. Shawn not only helped in getting that device, but he drove and picked it up himself and held it until the appt. Now to the tuning day itself. Once I arrived he was running a little behind due to the prior customer, no prob it happens. So while waiting he grabbed some cold water and a chair - first class guy. Now it was time for my vehicle. Pulled it up and got it on his dynos. Very interesting setup I haven't seen before. He took the time to explain the differences and pros. I wanted to leave him alone to do his tuning but holding back to ask questions. He tuned my car for many hours until it was perfect. I didn't care too much about numbers, but how the power comes on and dependability. Come to find out, he had to stay very late due to some other customer giving him a hard time. He told that customer he would help him (even though its the customers fuel pump that failed) not the tune. Man of his word - rare these days. In summery, if you want an amazing tune done by a great, standup guy then this is worth the drive (I came from San Diego) A+++++++++ read more

They promised 20% higher numbers over the phone. When I got there, the tuner didn't seem to care. He just wanted to get the job done. 20% is a big difference which was about 50 hp/tq in my situation. Thinking of finding a new shop to get a real tune. read more

Could not be happier with Shaun and Church Automotive. Car had a really bad tune from another shop. I brought it to Shaun with an extremely rough idle and excessive hesitation at the top end. In 3 hours Shaun was able to completely fix my top end issues, gap my spark plugs properly (he discovered they weren't gapped anywhere near the correct specs), and promised he would take a look at my idle issue again after I checked my car for a vacuum leak since none of his normal idle techniques did anything. After having another shop check and verify there were no leaks I visited Shaun again who was extremely patient with me and the unique idle issue we were seeing. After working with the TT manufacturer he discovered some tables that were changed quite extremely by the first shop. As promised, Shaun only charged me for the initial tune/spark plug gapping even though it required another 2 hours of work to get her running properly. Definitely worth the drive from Irvine! read more