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RESEARCH & DEVELOPMENT
At GPI we are hard at work pushing the limits of the LTx and LSx powertrains, and are laser focused on R&D which allows us to create the products our customers love!
TOP QUALITY
We are solely focused on selling only the highest quality products available.Here you will find our hand selected assortment of product that we recommend based on our many years of experience.
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Fast and free Shipping on all orders over $500. Always FREE In-Store Pickup!
Recent Customer reviews
Great Guys and always willing to go the extra mile to help you get what you need to have your build done right.
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.
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.
Very good people have been several times to get truck tuned and they always get it done right and in a timely manner!
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.
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!
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.
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!
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!
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!!
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!
thanks Erin, Ryan and James for taking care of me and the transmission rebuild. I really appreciate it. Great work
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.
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!!!!
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 !!!!!!
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.
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!
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.
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++
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.
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!
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!
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
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!
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
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.
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.
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.
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!!!
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.
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
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
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!
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!!
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...
Hands down best customer service and expertise on GM vehicles. LT headers, y-pipe, and tune on my '17 Silverado. Couldn't be happier! Will definitely be back for cam upgrade and more goodies 😉 Thanks guys, keep up the awesome work!
Quality products + quality customer service = Gwatney Performance Innovation. I will be doing business again !
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.
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!
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.
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.
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.
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.
GREAT JOB!!! GPI
Great bunch of guys with tons of knowledge. Willing to go above and beyond to make the customer happy.
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!
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.
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!
Second to none knowledge and just friendly service! Ryan did the tuning on my car and I'll never look to anyone else again.
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.