I've read quite different. If iirc a motorsport team did a dyno with NO pulleys (that's right no accessories driven) and only got 3 hp at the CRANK. That's little more than 1 HP at the wheel with NO accessories driven (as compared to underdrive where you may drive the accessories at what? 70%?). Not worth it IMO.TheDream21479 said:
Although maybe they save you a few pounds off our porky cars.