2.0 Turbo owners love to tease 3.6 ATS owners that they can't mod their engine, which is completely untrue! As GM 3.6 specialists, we offer the best tuning and unique products for your 3.6 motor. Our suggested modpath is as follows:

Overkill is very pleased to be a premier tuner for the 3.6 Direct Injection LFX V6 found in your 2013 to present ATS. As a GM V6 specialists, I love that GM packed this light little car with a healthy V6 powerplant, and you'll appreciate the benefits that an Overkill tune can bring. More power, more instantaneous response, support for your other aftermarket modifications and improved transmission behaviour and performance. The Overkill tune will improve your ATS 3.6's performance, make it more enjoyable to drive, make it drive lighter and easier.

What you'll notice:
  • You'll receive our Overkill 87, 91 and 93 octane tunes, with Overkill E85 Ethanol tuning if flex fuel enabled
  • Horsepower gains of 15-22 horsepower at the wheels depending on modifications, 30+ for E85
  • Smoother and more responsive throttle acceleration, harder acceleration from launch
  • Tuning support for your other aftermarket modifications including intake, exhaust, our 3.5" MAF and 80mm throttle body
  • Speed limiter removed, rev limiters increased
  • Improved transmission shift patterns in normal and sport mode, firmer WOT shifts

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Autocal Handheld: The best way for us to provide ATS 3.6 LFX tuning for you is through our Autocal handheld system. The Autocal handheld allows you to take the handheld to the vehicle, read the factory file, upload our Overkill tunes and provide scan data, with no laptop required. Return to stock calibration whenever you want, apply updates and retunes easily through email with us and Overkill retuning is available at no charge for as long as you own your ATS. The Autocal supports flex fuel enabling, and other items that the Diablosport option does not.

Overkill tuning is available if you already have an Intune or Trinity device and you want to step up from the preloaded tunes to something more customized to your ATS. Overkill tune files are provided through email which can then be uploaded to your Diablo device and flashed into your ATS just like the Diablo preloaded tunes. Purchase price will include several Overkill tunes plus no charge revisions for new modifications as needed for as long as you own your ATS.

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The only larger throttle body for the 2012+ LFX 3.6 is available here at Overkill. The factory throttle body is 72mm, as are ported units on the market. Our 80mm throttle body solution dwarfs the stock unit and will allow the your engine to breathe, improving horsepower, improving throttle response (particularly with Overkill tuning) and changes the intake note of the V6 to a deeper growl at heavy throttle.

Requires no tuning, works best when used with a ported intake manifold, such as available from JacFab. Uses brand new parts, comes with an aluminum adapter plate, stainless steel bolts and some parts to assist installation.

Tip: This throttle body has a 3.5" clamping area, compared to the factory throttle body of 3". Ensure you have a solution available before installing the throttle body!