If you have a 2008 to 2011 Cadillac CTS with the 3.6 Direct Injection motor, verified with the 8th digit of your VIN being a "V", then you're on the right page!





We're proud to be a premier tuner for the 2008-2011 CTS's 3.6 LLT Direct Injection V6 and one of the few outfits dedicated to tuning the oddball engine management computer in this generation V6 CTS. Gains of 15 wheel horsepower and up, provides improved performance gains from your intake and exhaust modifications, improves the transmission shift schedule to make the car quicker at all speeds and throttle positions, and more.

What you'll notice:
  • Horsepower gains of 15-20 horsepower at the wheels on 91 octane, depending on additional modifications
  • Stronger lower and mid rpm range torque
  • Transmission tuning creates a sportier shift pattern, lighter feel and improved part throttle acceleration
  • True manual shift mode available with reduced auto downshifting
  • Tuning support for aftermarket air intakes including larger MAF sensor solutions
  • Tuning support for high flow cats and headers including P0420/P0430 disable
  • Tuning support for aftermarket rear gear ratio change including auto transmission revision
  • Speed limiter removed, rev limiter can be raised in park
  • No charge revisions for new modifications as you add them







HP Tuners Suite: The way to provide our Overkill tuning for your CTS is to sell you your own HP Tuners suite. This is the same HP Tuner suite you purchase elsewhere but we include Overkill tuning services as well. This will allow for easy tuning delivery, custom tuning revisions and retuning for future modifications. Overkill Motorsport is an authorized HPTuner reseller.


Select HPT Suite
Enter Car's Modifications




Available exclusively at Overkill is the only larger throttle body upgrade for the LLT 3.6 engine. Not a machined or "ported" factory unit, this is a true larger throttle body, 76mm versus the factory 71mm. For your CTS, the gains are simple: more airflow at all throttle positions, significantly better throttle response, bolts right on with no wiring or manifold modifications required; inlet porting on the manifold is suggested to maximize the improvement in airflow but not required. No tuning is required for this upgrade! You will however need a new intake system coupler for the larger throttle body and it's 3.5" clamping area.

For K&N owners, use this 3.5" to 3.25" 90 degree silicone elbow (it will need 1.5" cut from each end) http://www.intakehoses.com/mm5/merchant.mvc?Screen=PROD&Product_Code=R90B-325-350&Category_Code=9DRESQ
For Airaid owners, use this 4" to 3.5" straight reducing coupler http://www.siliconeintakes.com/intake-pipe-reducer/pipe-reducer-p-539.html




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