Overkill LFX tuning is a performance recalibration of the engine and transmission computers. The benefits of an Overkill tune are straight forward: More power, more instantaneous, improved transmission performance, and proper support for your additional modifications. Whether you're an enthusiast or consider yourself a regular car owner, these are changes that you'll appreciate and enjoy every time you drive your SUV.

Features/Benefits:
  • Horsepower and torque gains of 15-30 on 91 octane and 10-15 on 87 octane anticipated
  • Stronger mid-range power, less peaky feeling to the power delivery
  • Improved throttle response, more natural and consistent throttle feel
  • Increased fuel mileage capability, will depend on your driving style
  • Overkilled transmission revises the part throttle shift pattern will downshift with less throttle input, upshift at better engine rpms, reduce torque converter bogging around town, and improve how the vehicle feels in daily driving by feeling lighter and easier to drive
  • Support for your other aftermarket modifications including our intake system, aftermarket exhaust systems, our 80mm throttle body, JacFab intake spacer and more.
  • Speed Limiter Removal, Engine park rev limiter raised
  • No charge revisions for your future modifications, including no charge for our throttle body upgrades


What you'll get with your purchase:
  • An Autocal handheld tuning device, with software on a USB drive
  • Overkill 91/93 octane tune
  • Overkill 87 octane tune
  • Overkill E85 Flex Fuel performance tuning in each tune (if you have an E85 Flex Fuel ready vehicle)
  • Tuning support for datalogging and custom revisions
  • Tuning support for new mods as you add them, for as long as you own the vehicle







EFI Live Autocal is an easy way for us to deliver your Overkill tune. The Autocal handheld is a handheld you take to the vehicle to read and write the tunes, no laptop required. Our tunes are supplied through email after a quick exchange where you read your vehicle, email us the factory tune file, and receive back your Overkill tunes. The handheld fits in your glovebox or center console to easily switch between different Overkill tunes or return to factory calibration with a few simple clicks and a few minutes. Datalogging (scanning your vehicle and sending the saved file) allows us to dial in your custom tune at no additional charge. Receive updates for new modifications at no charge.
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Overkill has the only intake on the market for the 2012+ 3.6 Equinox/Terrain/SRX. It replaces your factory air filter housing and tubing with a 3.5" silicone elbow, a 3.5" machined aluminum MAF housing and a cone air filter, with necessary fittings and clamps. Greatly improved flow and a great sound, this is a great way to start your modifications, or pair with Overkill tuning for best results.

Tech tip: This system works with both our 80mm throttle or your factory throttle body.







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, but works even better with Overkill tuning. Your factory intake manifold is already 79.5mm inlet (see pic below), no porting required to take full advantage, making this a GREAT upgrade! Tip: Clamping area on this throttle body is 3.5" versus 3" factory. Your factory intake won't work, but this does work great with our Overkill intake.









Want a great deal? Of course you do. Because our intake and throttle body combo work hand in hand together, here's a chance to buy them together, at a discount. This combo works with factory tuning and even better with Overkill tuning. If you have Overkill tuning currently, you'll receive a no charge revision.





This intake manifold spacer, made by our friends at Jacfab, goes between the upper and lower manifolds. Unlike a comparatively useless throttle body spacer, this spacer effectively increases the runner (air passage) length of each individual cylinder and increases the overall intake manifold volume. This results in dyno tested torque gains of 7-15 lbs-ft through the mid- rpm range where you want it. Straight forward installation, great to do with our throttle body upgrade or at any stage of your modding. Comes with new stainless steel bolts.



We're testing the fitment of the JacFab spacer on the Equinox/Terrain/SRX platform. The throttle body to firewall clearance may become an issue on this platform and we're in need of more feedback. Please email us if you're interested in test fitting this product on our SRX/Equinox/Terrain.





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