I took both my mustangs here for tuning and have also purchased a supercharger. Ricardo and Gonzalo are top notch people to deal with and there customer service is second to none. They will tell you exactly what hp your car will make with various products since they dyno so many cars. You will not be disappointed. Check them out. read more

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

I have nothing to say to this place, I ordered my front splitter weeks ago and every time I call to make installment appointment, they told me to wait 20mins then call them back. It takes 1month to finally make the appointment. And the guy who picks up phone calls are impolite. I do not think I will come here in my life after the installment read more

Best Performance Shop in SoCal!! Gonzalo, Perdo, Josh and Richardo are amazing people with great Knowledge about High Performance vehicles especially mustang. GTR is the only shop that touches my 2015 GT S/C mustang. read more

I've been coming to GTR for 2 years now, and since day one no matter what the maintenance, performance upgrade, or repair issue is; Ive received the same level of customer service that you see every business advertise but very few receive. GTR goes the extra mile for their customers because they know that, THAT is how you earn lifetime customers. Gonzalo, Ricardo, Andrew, Josh and all their staff are some of the most professional and courteous people I've dealt with. I refuse to take my Mustang anywhere but to GTR HiPo. read more

I first brought my old 2006 Mustang to GTR in 2014, and from the very first call I placed to GTR they have been nothing but professional, welcoming, friendly, and extremely helpful. The prices are great, the quality of work is superb, and the attention to detail is exceptional. Ricardo and his staff has been my go-to whenever I have a question or request. Now I own a 2015 Mustang, and I will continue to take my car to GTR for future mods, but also basic maintenance. read more

Absolutely thrilled with the work & customer service from Gonzalo & Ricardo at GTR high performance. I spoke with them both several times while choosing a clutch for my 2017 gt and they were patient, knowledgable, and informative every time. Their work is impeccable, and the care with which they treat their customers also extends to the vehicles in their care. When I dropped my car off it was freshly waxed, clean from top to bottom...I swear it came back cleaner. They go out of their way to provide great customer service and high quality work and it shows. read more

These guys continue to amaze me. The are simply the best when it comes to taking care and upgrading your Mustang. (Even though they specialize in Mustangs, I have seen them work on other cars too.) Just last week my fuel pump went out. Even though they were incredibly busy, they still fit me in and got me on the road the next business day. The cool thing is that whether you are spending $10,000 on making your car a beast or just have a busted fuel pump, they will treat you with the same level of care. I simply can not say enough good things about this remarkable business. read more

GTR is awesome. This is my 2nd time coming to them. This time, i am changing my Automatic to Manuel. All the work is almost done, and Recardo found all the parts for me. That is exceptional. I did not have to find anything. GTR is the best. I will always take my car to them. I am excited on the final day that my car will be finished, and know that the work will be great. These guys know what they are doing. Recardo, Gonzalo and elie and totally awesome. I trust them on any car repair. I don't have to think about my car, they do that for me. I am so greatful to be a part of their team. Evans Gilmore. read more

Love these guys, they do awesome work and very friendly. Had them install some headers on my stang and they did a great job. Would recommend to anyone! read more

I can't say enough good things about this shop! After researching multiple shops, I was blown away by the time and patience Gonzalo spent on the phone with me to answer all my questions. I felt so comfortable talking on the phone with him that I ended up making the 4 and 1/2 hour drive fom Paso Robles to have them install a smaller supercharger pulley, new heat exchanger, and Dyno tune my 2003 cobra. Ricardo took his time and asked me about what modifications I had on the car, and made sure my car was in good mechanical condition before the parts installation. Gonzalo even offered to drive me to get lunch while I was waiting! Great shop, nice people, and my car now runs much smoother and of course faster!!! A++++!!!!!!!! read more

Horrible service, everything started with me getting a quote for a clutch job on my 2004 mustang GT I had msg their page to get a quote they initially asked me if it had any moddifications that would take more time to work on I gave them a list of them and they told me that with the bbk long tube headers it would take longer thus they would charge me 400 dollars for the job, a couple weeks went by and I called in to get a quote in addition to the clutch job I already had a quote for, when I called it took them about 20 min just to get back to me seems like they had a new person helping because he knew nothing about pricing and would take forever to go ask and respond, at the end he gave me the new quote for the clutch job at 420 with the long tubes, I messaged them to ask if I would need an appointment to get the clutch done and they respond with a new price for the third time and state that the job will now cost me $600, they have horrible service and very un-professional, I had been there before on their dyno day and seemed a lot more professional when I had been there seems things have changed read more

Nothing but good things to say about this place. Gonzalo, Pedro, and Ricardo are all awesome. Very professional but still get a down to earth and welcoming vibe. I will definitely be coming back! read more

Run the other way. They used to sell my products, and they still messed up one of my cars. Broke a transmission fluid line, and asked me to fix it. I know a lot of you mustangs guy are new, but do yourself a favor. Run the other way before you really get yourself into a jam. Find another shop. read more

Was looking for a good tuning place all over, and although there was many near my location i always seemed to get recommendations to come to GTR. In the end i decided to trailer my car here even thought it was 40 miles from home. Needless to say this is probably the best place in California to get your car tuned and sorted out. Ricardo spend nearly all day on my car, troubleshooting and getting the car to run right. He is super knowledgeable and explains what he is doing throughout the day. He makes sure you are well taken care of while in the shop. Iv'e been to many auto shops before and have never experienced such high caliber customer service. After he was done tuning the car and left home my car would not shift into 1st, or 3rd so i limped back to the shop, Ricardo had left to attend personal matters and he still took the time to come back and get my car fixed. The issues were cause by myself and not him and he still managed to get the car running like new. Prices are more than fair, iv'e heard from other mustang fanatics that prices are high, but you really get what you pay for here. Car is currently running like new and will definitely be stopping by again when i finish saving for my GT500. Again thanks Ricardo you are the best! read more

picked up my 2005 gt mustang yesterday had a new clutch and a set of jba shortys they did a great job i saw a little custom work on the headers which is appreciated car runs great with the mods i allready had i will defenitely be back these guys are great read more

Brought my car here for gear install and lowering springs. Great customer service. It's been about 2 years and no problems whatsoever. Highly recommend. read more