As GM 3.6 specialists, we offer the best tuning and unique products for your 3.6 motor. Our suggested modpath for the 2012-16 W-Body Impala platform is as follows:

We are pleased to be a premier tuner for the 3.6 Direct Injection V6, codename "LFX", found in your 2012 and newer W-Body Impala. As V6 tuning specialists, Overkill is here to support all platforms that this engine equips, and we're very pleased that GM gave the last of the W-Bodys a great run with this terrific V6.

Overkill LFX tuning is a complete and thorough recalibration of the engine and transmission computers. More power, better response, improved fuel economy, improved transmission behaviour, support for aftermarket modifications, whether you're an enthusiast or consider yourself a regular car own, these are changes that you'll appreciate and enjoy every time you drive your Impala.

  • Horsepower gains of 10-20 horsepower at the wheels depending on modifications
  • Smoother acceleration, more mid-range power, less peaky feeling to the power delivery
  • Instant throttle response, no more rubber band feel, NO NEED FOR EXTERNAL THROTTLE BOOSTERS!
  • Increased fuel mileage capability, 1-3 MPG gains will depend on your driving style
  • Fully rewritten transmission shift points 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
  • Raised 6800-6900rpm full throttle upshifts, 1st/2nd/3rd gear downshifts available at higher road speeds for improved acceleration
  • Revised cooling fans with 1 minute engine off continuous operation at key off (HPTuners tune only)
  • Improved engine knock response times for improved engine safety
  • Improved engine knock spark recovery rates for improved performance
  • Tracton control less intrusive on hard acceleration (HPTuners tune only)
  • Speed Limiter Removal, Engine park rev limiter raised
  • P0420 code removed for high flow cat converters, request other codes removed
  • No charge revisions for your future modifications

What year Impala is yours
Any current modifications

Autocal Handheld: The best way for us to provide tuning for your 2012+ Impala 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 using just the handheld unit inside the vehicle. 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 vehicle. You'll need a computer that can run a windows based program and has a USB port to transfer files to and from the handheld.