SPRINT BOOSTER MERCEDES-BENZ C-CLASS E-CLASS GLK Automatic SBME0012s At low revs, the engine responds at approximately half the time in comparison to before. The delay time whilst accelerating in 3rd and 4th gear and the engine in the mid-range,is almost zero. Big differences in the higher rev range. Improved response for down shifts and safer overtaking. Overall safety and more fun on the road!