As someone who is taking the m90 to the Nth degree, i can tell you that the zzp z3 turbo kit is much cheaper and with an inter cooler off a junkyard turbo car you'll make a good amount more power . Granted thats Cammed, e85, intercooled , methanol injectected m90 , vs basically a 91 turbo kit. Ill probably have over 5k in my SC by the time im done. ZZP kit (if legal ) is 2400 bucks, 3000 if you get the full downpipe and new injectors .