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2 days ago

Derek Mcgrew

Had Ben tune my car. Using the SS4 NFC and ported heads. Hit 496.5 to wheels. Spot on tune. Worth the 7 hour drive to get there... See MoreSee Less

2 days ago

Charles Johnson

They basically tore up my partner zl1 and then told him it’s not there fault. They install a meth system and did not tell him he could not turn it off until after the motor locked up he tried taking it back and they tried to charge him more. I do not recommend them.... See MoreSee Less

2 weeks ago

Tex Erwin

Great guys.. Definitely know their stuff..... See MoreSee Less

I used to work with these guys, and they truly are a great team with great service and great products!... See MoreSee Less

4 weeks ago

Luke Sawdy

These guys are great and knowledgeable. I called with questions about my upgrades prior to scheduling my sons truck to be tuned and they were very helpful. Got the truck in and out in a timely manner, and kept me up on the progress. James is who I spoke/dealt with and what a great experience it was. Thanks guys for making my 16 year old son smile with a smooth running, great sounding truck.... See MoreSee Less

1 month ago

Dalton Hale

Great Guys and always willing to go the extra mile to help you get what you need to have your build done right.... See MoreSee Less

1 month ago

Jamey Harkreader

Amazing atmosphere, amazing parts, amazing service, with amazing people!! 5 ⭐️... See MoreSee Less

2 months ago

Brandon Luedeman

Remote tune service was spectacular! Highly recommend!... See MoreSee Less

2 months ago

James Fritcher

great product great service. great people!... See MoreSee Less

2 months ago

Scott Martin

Even though we had a slight catastrophic mechanical failure, these guys went above and beyond what I expected! From management down, top notch service. They didn’t hesitate to answer any questions or concerns. Definitely be doing business with them on my next build.... See MoreSee Less

2 months ago

Brandon Phillips

great customer service Ryan does a great job... See MoreSee Less

3 months ago

Leray Kemp

everything about them it good so I highly recommend them... See MoreSee Less

3 months ago

Scott Branton

They do an amazing job of adding a ton of power, and they warranty everything!... See MoreSee Less

3 months ago

Mike Ward

James and Aaron are awesome. They have treated my 06 HO Silverado Like it was a C7 Vett. I trust no one other then James, Aaron, and their team at GPI to dig into my drivetrain on my truck.... See MoreSee Less

3 months ago

Chris Stephen

james and Ryan and Ben and Juan were great! got my vette where it needed to be! thanks guys!... See MoreSee Less

4 months ago

Paul Vega

Very good people have been several times to get truck tuned and they always get it done right and in a timely manner!... See MoreSee Less

5 months ago

Josh Hubbard

All the guys did top notch work on my G8 earlier this year. They added flex fuel conversion along with Fore dual pumps on my existing LSA setup. Ryan even walked out and adjusted my shift points on the spot when I stopped in to ask about leaving my car.... See MoreSee Less

5 months ago

Adam Allen

Huge thanks to the GPI team (especially James) for the amazing work they did on my G8.

James took the time to listen and address all my needs in detail - while providing top notch customer service in walking me through various build options that fit my budget.

We ended up doing a forged stroker kit that provided amazing torque and unbelievable throttle response (especially for my 4000 lb car). It feels and drives like a whole new beast!

I highly recommend GPI for any level of build!
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6 months ago

Alvin Batten

Ronnie and Ryan are two of the most stand up guys in the business. Best customer service I’ve ever had. My car sounds and runs amazing. If you’re considering the other two options for a cam, try contacting them after hours and see where it gets you. These guys were always responsive extremely knowledgeable and both went above and beyond to make sure I had what I needed for my goals. Thank you both again, I’m a loyal customer for life.... See MoreSee Less

7 months ago

Jamie Stwalley

Great team to talk to, support, and install your builds. From early stages and planning to executing and finalizing your build. Best customer service you will find along with the design and parts to execute what you're looking for. GPI is who I'd refer anyone too from small to extreme builds. Team GPI!... See MoreSee Less

I would trust nobody else with my C6 Z06. Aaron really took the time on the phone to walk me through all the options on what the best mods would be for my goals. Extremely knowledgeable and helpful staff. Aaron, Ryan and the entire team over there are extremely nice and know what they are doing. I am extremely happy with the result of their work on my Z06. They even finished it a little earlier than quoted, which is unheard of in this business. GPI has a customer/friend for life now. This is how you are supposed to do business. Highly recommended!... See MoreSee Less

7 months ago

Chad Jackson

I purchased the SS3 VVT cam and install kit along with a Circle D converter for my 2011 Camaro SS (L99). The car is a new animal now. This company is top notch, from Ronnie helping me with purchasing my items and Ryan remote tuning it! Thank you again for everything!!... See MoreSee Less

8 months ago

John Hearne

They are top notch service. Great group an always helpful.... See MoreSee Less

8 months ago

Edie Palmer Riggs

Awesome group of guys! Very friendly and knowledgeable. This shop defines great customer service. We were on a very tight timeframe trying to get to Cruise the Coast and they worked us in and got the car running GREAT! Would not have been able to bring the car without their help. Thanks!... See MoreSee Less

8 months ago

Jerome Norman Boyd

thanks Erin, Ryan and James for taking care of me and the transmission rebuild. I really appreciate it. Great work... See MoreSee Less

8 months ago

Jonathan Holliday

GPI really brought my 2004 Yukon Denali back to life with a rebuild and their Stage 1 truck cam package. It sounds amazing and drives better than new! I recommend GPI to anyone looking to step up their LS at a great price.... See MoreSee Less

9 months ago

Samuel Morgan

Very pleased with the tune big thanks to the guys at gpi... See MoreSee Less

9 months ago

Larry Morgan

EVERYONE i met and talked to was so friendly and professional. By far the best dealership and performace shop i have been to.. Ryan tooned and dynoed my car in 3 hrs and it is perfect!!!!... See MoreSee Less

9 months ago

Larry Adams

I don't know where to begin, GPI has been taking care of my car for the last 2 years... their customer service and support after the sale is not 5 stars but 10 !!!!!! Ryan Stevens and the whole crew at Gwatney Performance Innovations are car performance enthusiast. Aaron, the GPI shop manager is always thinking outside the box. His R&D program is consistently spending time on Cam and Engine dynos working towards the best and most reliable GPI performance parts you can purchase. All you gen-6 guys hang on, it's fixing to get real !!!!! hands down the best Performance Shop I've ever dealt with... go see or give the guys a call at GPI you will not regret it !!!!!!... See MoreSee Less

11 months ago

Kris Crim

I've taken two different 5th Gen Camaros to GPI and have been very pleased with their work. The crew at GPI is so knowledgeable and Aaron, Ryan and James are great to work with. They are all about helping you meet your goals, work within your budget, and sharing their expert part/product knowledge. Whatever your goals for your vehicle are, GPI can help you get there.... See MoreSee Less

11 months ago

Carl Stevens

Just picked our ‘06 Z-06 up at Gwantney Performance Innovations, which they pulled the heads and checked the usual concerns that most Ls-7 owners have about the original heads. Bottom line the crew there was top notch in every aspect from being very knowledgeable and considerate to treating the vehicle like it was theirs. Can’t say thanks enough. Will definitely be back for any further work. A special thanks to Aaron and James to whom I spoke with directly and thanks to the rest of the crew!... See MoreSee Less

These guys tuned my 2016 Sierra and after having it for about two days now, I absolutely love how it changed this truck. Better fuel economy, none of that sluggish GM shift points. 10/10 in my books and A+ customer service, I would trust these guys with any performance work that you need.... See MoreSee Less

Great shop knows there stuff and how to do it right. I will be coming back soon... See MoreSee Less

GPI Is one of the BEST performance shops around. I have been using them for performance parts for my 5th Gen and 6th Gen Camaros for the past 4 years. I could not be more pleased and happy with their camshafts, tuning, 6L80 trans bench build, and overall build advice. If you are looking for proven performance, GPI is the right place for you. They do not just dyno their products, they actually track race them and get real data. Their customer service is top notch and they will bend over backwards to make sure their customers are happy. A++... See MoreSee Less

I've been accumulating GPI parts all winter, from the SS1 VVT cam kit, to the ported GPI intake rod mod. Dan, Ryan, Aaron - everyone I have dealt with has been A+. These guys have a great reputation for what they can do for your car, but its also nice to know theyre some of the best in the business to work with. Money well spent for both perfomance and support, so thanks for everything GPI.... See MoreSee Less

Great customer service. Been bothering Dan for 3 days asking many questions, some over and over again, and he answered all of them like an expert. Bought 3.91 gears from them yesterday and will be going back shortly for a cam. Appreciate it fellas!... See MoreSee Less

I recently took my '07 C6 Z06 to GPI to have quite a bit of mods performed. They did an incredible job! They were timely in getting me my car back as promised. They are very, very professional and they go out of their way to make you feel valued. I've been getting non-stop compliments on how good my car sounds now. I've had no trouble out of it thus far. I would HIGHLY recommend GPI to anyone! Great people!... See MoreSee Less

Running a GPI SS4 cam in my personal car and I couldn't be happier! Performance is exceptional, and customer service is second to none. I recommend their products to all of my customers. Will happily continue doing business with GPI in the future! #TeamGPI... See MoreSee Less

Guys were great to deal with, and Mike even helped me load the Camaro for it's trip home today. Keep up the good work!... See MoreSee Less

Service, and tech support is 2nd to none!! Always a pleasure to do business with them, and they make everybody feel like your apart of team GPI... See MoreSee Less

Could not be happier with my car Gwatney built. Almost 1000 wheel horsepower and i could drive it anywhere. The work under the hood is flawless.... See MoreSee Less

I just ordered the ss3 vvt camkit, and I'm beyond excited to get it and install it. Literally a 5 star rating based on just responsiveness to emails and willing to answer any questions you may have. The answers are in detail as well, not just shortened responses. I've seen the way these 5th gens are running with this cam package and its far beyond the competition.... See MoreSee Less

5 stars does not begin to describe the level of Knowledge and Service you will receive from the guys at GPI. Trust me when I say, these guys know the LS Platform inside and out. I've had my car upgraded at other performance shops, but nothing has ever came close to the level of expertise, service, and performance they put together for me. My car was the test car for the Max Performance LS3 package and I could not be happier, this new package is what you should be looking for if you want your LS3 to go to places that other shops say are impossible on stock bottom end cars. From Aaron putting the package together with only the needed components, to Ryan and his tuning skills giving you everything your car can offer and still retain driveability to take it anywhere. My car will never go to anyone else. Thanks Again to Everyone @ GPI for all your hard work, never stop pushing the envelope.... See MoreSee Less

The GPI guys were well worth the 12 hour drive from Jupiter Florida to Jacksonville Arkansas!! Thank you for making my 2015 Camaro V6 twin turbo dyno at over 600 RWHP!! Aaron is a Great person to work with. Thank you everyone at GPI!!!... See MoreSee Less

Aaron, James and Ryan are class act guys who really know their stuff. Did a awesome job turning my 5th Gen into a beast! This is the only place you should take your Camaro.... See MoreSee Less

Dan - James - "Patient" online chats, phone calls, 2 of the best guys to work with, when your a novice such as myself you need extra hand holding

They were available to answer all questions - Totally recommend them
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They had the best customer service in any business I've ever dealt with . Thank you Dan .I have a 2011 camaro ss An can't wait to see what my power gains will be with there ss3 cam . Supporting modes are 1-7/8headers,3inch exhaust , an cold air intake... See MoreSee Less

Excellent experience at GPI. Made a 700 mile/11 hours trip down to make sure things were done right, and they were! Couldn't be happier with the entire process from communication with James, 1 day engine tear down AND rebuild with Nathan, and of course the VVT cam tuning with Ryan. Definitely can recommend these guys!... See MoreSee Less

GPI is by far the best! Excellent customer service and willing to answer questions for whatever you need. Definitely will be buying more from them. Love my SS3 VVT cam in my 2012 Camaro SS!!... See MoreSee Less

The whole crew at GPI are class acts. From Ryan on the dyno, Aaron pointing the customers to the best $$$ spent to James making sure you leave satisfied. The dyno tuned a twin turbo 2015 Camaro for me and install some other items for safe horsepower...... See MoreSee Less

these guys make power for the SS Camaro! Minimal mods and I am over 470 rwhp and rwtq!... See MoreSee Less

Great customer service. Very knowledgeable great parts. Thanks Aaron!... See MoreSee Less

Quality products + quality customer service = Gwatney Performance Innovation. I will be doing business again !... See MoreSee Less

Great product and even better service!!! Loving my new blower cam.... See MoreSee Less

Being that my 15 ss is the first car I'm building I received nothing but the best customer service I've ever experienced from anywhere. They broke everything down for me as what to expect the positives and negatives of each part and what all I would need to do based on how aggressive of a build I want to do. I live up in md so they won't be installing the parts but I ordered the ss3 vvt cam package with the afm delete kit and a few other optional pieces. Complimented by a circle d 4000 triple disc stall. I will order the 3.91 gear set soon as well and she will be track ready. Videos and times and numbers will be shared with them. Can't wait.... See MoreSee Less

I recently had the GPI SS3 VVT camshaft and a new torque converter installed in my 2012 Camaro SS. Now when I hit the gas pedal my car explodes down the street and the cam sounds absolutely incredible! Ryan took a lot of time to answer a ton of my questions. His exceptional advice and expertise guided me on what parts to buy to reach the specific goals I was seeking for my car. I cannot thank Ryan enough for his help and sharing his knowledge with me. If you are in the market for a camshaft, look no further than GPI and their awesome staff for expert support!... See MoreSee Less

Just a great group of guys to deal with. Friendly, professional, and very knowledgeable. Aaron answered my numerous emails and provided a wealth of information.... See MoreSee Less

Aaron was fast in replying to my emails and gave me quick info, James got me in very quickly and showed great customer service, the crew did great when installing my headers, and Ryan tuned my 2012 SS and it performs better than I ever could have thought! Awesome place with an awesome crew. I will be going back for future modifications.... See MoreSee Less

Excellent service, bought my 2010 Cobalt from here, always bring it to them for services.... See MoreSee Less

great service and support! did everything right and on time!... See MoreSee Less

Amazing customer service! Very highly recommend for all your LS needs... See MoreSee Less

I have an ongoing oil leak problem on my car, they fixed the leak twice so far, but they are trying to get to the root cause of the problem, my hometown dealer who I purchased six vehicles from told me he didnt want to work on my car. Why?? Because they never fixed my oil leak. Aaron, Ryan, Mike, James, and Josh are great guys, they got me fixed, and are willing to do what it takes to make it right, I've been seeing Ryan on forums as a tuner/ engine builder since 2003 or 2004, he's been very helpful and knowledgeable.... See MoreSee Less

This is the shop to take your car too!!
The guys are friendly and know their cars!
They turned my 13's sec. into a 10 sec car.
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Awesome place ! Ryan Stephens is an expert in his field !
He did wonders to a friends car.
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Great bunch of guys with tons of knowledge. Willing to go above and beyond to make the customer happy.... See MoreSee Less

Have been working with them for 2 years, great service!!!... See MoreSee Less

These guys are awesome! Can't recommend them enough! They put their SS2 cam / headers in my Z06 damn!! It's a beast! Love the chop!... See MoreSee Less

Best of the best!... See MoreSee Less

GPI has an awesome team, great place to take your hot rod. I have lost count how many 5hr trips I've made from Dallas just for these guys to work on my 5th gen.... See MoreSee Less

Great guys, great service, great performance! Do not hesitate to call them with any of your performance ideas/goals. They can get it done! 5/5!... See MoreSee Less

Friendly people, fast service, excellent quality and customer service.... See MoreSee Less

Second to none knowledge and just friendly service! Ryan did the tuning on my car and I'll never look to anyone else again.... See MoreSee Less

Don't expect new valve stems with a new tire purchase, and be ready to wait 4 hours to get 4 tires installed. Oil change is a hour to hour and a half wait. Otherwise good mechanics on hand to fix what fails hopefully the first time and not repeatedly. Good people work here is why I keep coming back.... See MoreSee Less

Top of the line.... See MoreSee Less

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