Bushur Racing uses their intake and exhuast manifolds and so do some of the fastest cars down south as well. Their prices are about the same as O2 and so is the quality when I saw one on an EVO when I was in ATL. They start around 740 which is enough to deter most people that feign interest in them. They have VE manifolds which caught my eye and I might get one when I get some more specs on them and recover from my latest spending spree .