which would be better for a twin turbo setup w/ vortec heads?? how about NA??

thanks

 

i don't know but i have the MR3 and while it finally works nice it required alot of machining to work right. for the price i could have bought another iroc. i say try something else. you may be down a few numbers but the extra weight in your wallet will be worth it.

tpis and their parts are junk......