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I have APR stage 2 on my s4 along with the pulley. Seems pretty solid to me. Very good customer service from them. Don't know if that really helps on the 997 TT. But I am getting their software on mine.

 

We put a 93 octane APR tune on our '09 Turbo and saw average gains of 50.4 peak HP and 76.5 ft/lbs peak torque at the wheels with all other equipment remaining stock. Air fuel ratios remained very safe. It sure makes the car more fun to drive.

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