Audi B9 S4 Tuning

Z Calibration's ECU software is expertly calibrated and painstakingly tweaked to offer you MORE of a good thing.

By delivering useable power through enhanced throttle response and torque control, you may get more horsepower, more torque, and an even more thrilling driving experience.

Acceleration out of your favorite corner and into the straight is visibly quicker across the rev range thanks to the extra ft. lbs. of torque through the mid-range.

Your factory/stock ECU settings are saved by Z Calibration, allowing you to easily return your car to its initial configuration at any time.

Tuning to a particular octane
Downpipe Cars will have no errors and for offroad use only !
Removal of the top speed limitation
Whenever available, increased  burble.