Does anyone know much horsepower gain I will have with putting on a rk sport ecotec crank pulley? Does anyone have one on their cars? Just looking for some opinions.
crank pulleys do not produce horsepower, they are a helper mod, so basically unless you have a ton of other stuff done it makes little difference

1989 Turbo Trans Am #82, 2007 Cobalt SS G85
Quicker revs, snappier TB responce, thats about it...

ECOTEC now with Maximum Bolt-Ons!!
They free up a few hp, every little bit adds up right?
Don't buy from MANTAPART!!