Looking for more rear drive bias in your Audi? Tired of front wheel spin?
Put power to the ground more effectively with the STaSIS high-bias center Torsen for your manual transmission Audi. Converting from the stock 2:1 ratio to the STaSIS 4:1 ratio enables an increase from 66% to 80% in torque distribution. Use your all wheel drive to its fullest potential and extract the most from your quattro driveline.

Tuning the center differential provides one of the most significant performance gains available to the Quattro owner. The standard torsen center differential in the Audi S4 provides a 2:1 torque distribution capability. This enables the end of the car with traction (generally the rear) to deliver twice the torque being delivered by the least tractive end of the vehicle (generally the front). For high performance street cars, we recommend a bias ratio of 4:1. This is the same bias ratio that Audi has provided in the stock RS4 driveline.

The STaSIS high bias torsen provides a dramatic improvement in negotiating a turn quickly and efficiently. Now your car can be 3 cars in one( front, all and rear wheel drive):

Hard braking leading into a turn
Car acts like a front wheel drive - torsen acts like an open differential when its not under power. Wheels turn independently and car control is improved.

Mid Corner, Throttle On
Car acts like an all wheel drive - torsen delivers equal amounts of power to front and rear wheels. This maximizes grip, allowing more power to be applied at this stage of a turn.

Corner Exit, Hard Acceleration
Car acts like a rear wheel drive car - front wheel slip is reduced because the torsen delivers up to 88% of the engine torque to the rear wheels where the most traction is.

Note:
There is a core charge of $1,000 if we send out a STaSIS center differential to you. When you exchange your center differential for a STaSIS unit, send your differential back to STaSIS and we will refund the $1,000 core charge.
You may also send your differential to us for modification and not incur a core charge.