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103MM TB Dyno Testing

How much power?

Track Attack LS3 Piston & Rods Kit

The Definitive Max Effort NA LS3 Piston & Rods Package!

Complete LS / LT Cam Kits

The most comprehensive cam install kits on the market.

Gen V LT Drop-In Piston Rod Kit

Shop the Top Selling Drop-In Piston Rod Combo for big power Gen V LT's. Now available in low compression options.

Recent Content

103MM Throttle Body on LS3 Intake Manifold. How Much Power?

One of the questions that we’ve often been asked by our customers is “Can I add a 103mm throttle body to my OEM LS3 intake

Melling Oil Pump Upgrade Guide for LS

The factory LS oil pump suffers from cavitation above 6,200 RPM, which results in a drop in oil flow of nearly 1 GPM by 7,000

Gearing and Converter Options for Camaro and Corvette (Part 2 – Automatic Cars)

Introduction Welcome back to Part 2 of our discussion on late model GM gearing and converter choices (want to read the Part 1 on Manual

Gearing and Converter Options for Camaro and Corvette (Part 1 – Manual Cars)

Introduction: You don’t need to browse social media or a technical forum for very long to find a thread about “which gear (and converter –

Discount Programs

myGPI Reward Program

Start getting the most out of every GPI purchase you make. As a myGPI member, you can cash in on exclusive benefits that make shopping with us even more rewarding.

Military Discount

Gwatney Performance offers a Military Discount on most products to extend our gratitude to those who have served or are serving our country in the US armed forces.

Dealer Program

We are always looking to partner with reputable business looking to carry and support our brand. Please check the dealer application page for more details and requirements.

Recent Reviews

The folks at GPI are both professional and very knowledgeable. I was treated fairly. All my questions were answered to my satisfaction. They will treat your baby as if it was their own. I was briefed every step of the way. It is apparent the fine men there are dedicated to satisfying the customer.

GPI FTW simple as that. The customer service is the best. You can't go wrong with buying from these guys.

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.

Bought their ported/rod modded intake manifold for my 2010 Camaro SS L99 and holy crap, it's amazing! The porting looked well done and I am very impressed!

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!

Great people and great service.

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