96 z28 mods include paxton supercharger (low boost) gp2 heads comp cam comp roller rockers injectors(that i believe are too big the car is running very very rich) headers and flowmaster exhaust got other sutff done too but i believe thats all the power adder mods . i am torn between centerforce dual friction which i see there are two and one costs in the 300 range and the other in the 600 dollar range i dont know what i difference is between these two and the other is a zoom kevlar that is 418 dollars. this car is a street car and usually a weekend cruiser but sometimes does get driven all week.