Gwatney Performance Innovation can perform nearly every performance modification imaginable to a wide variety of vehicles. Custom ground camshafts have become a mainstay at GPI – especially for the LSx motor platform. We often venture into Supercharged and Nitrous projects – and bring the total package together with a custom tune using our own in-house DYNO. 

GPI Team

Aaron Salisbury
Fixed Operations Director

Ryan Stevens
Head Calibrator

James Zajac
Service Manager

GPI Reviews

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

Initial impression was great while dropping off my car for modifications. Can't wait to get back a monster. I have the utmost confidence they will meet expectations based on past customer recommendations.... 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

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!... 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

Ordered the SS3 cam kit for my Camaro and it came in and was beautiful. Can't wait to have it put in and tuned. Only thing I noticed was there was no cam card for it so I don't know the exact specs of the cam. Will be doing the rod mod and heads soon.... 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

After having just moved in the area, I asked friends in my Corvette Club where to take my car to get the most out it by just tuning. They recommended GPI. I took my c6 in to get tuned.
I called James on the phone and he said that we will take care of it. Well, low and behold they did! Ryan, James and Arron did what they said they would do! It shifts firm but not hard and way more power than any other tuners got out of it! Drive ability is fantastic! I really can't say enough about this performance shop!
Oh,by the way, the car is powered by a Chevrolet crate motor. I blew the LS2 up at 80000 miles. It has a beefed 6L80E trans. The motor is a stock LSX454.
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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

Consumer focused in every way! No matter your budget they can and will help..... See MoreSee Less

Love my car and how it performs after the tune....snatches second and third like a champ! Huge thanks to James for always hooking me up and taking care of my babe!!!... 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.
GREAT JOB!!! GPI
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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

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

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

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