Our AutoThority chip upgrade provides your 85-86 928S with an approximate 20+ horsepower gain at the wheels and an approximate 20+ ft/lbs torque gain to go along with it. The low-end torque and throttle response are improved and the driveability is smooth throughout the entire power band. The performance can be felt right away as your 928S will speed through the revs quickly before reaching the raised rev limiter. The rev limiter has been raised 300 RPM in each gear and there is no top speed limiter. Our AutoThority Performance Chip is a simple upgrade and comes with full instructions on how to install it in your 928S.