ive heard both so im not sure either....but you dont necesarily need 150 extra hp...50-100 size shot kits are still big increases in power and as long as its all installed fine and not abused (to an extent!) i think it wont put much more wear than say a SC or turbo, but thats what i htink im not sure............have u seen Fast and furious or something cause i did and i want NOS Too!!