Well, Comptech's headers have been out for 3 years and they have been proven to huge power gains. Prototype Racing has been saying they will come out with headers for our car since 1999......and I still have not seen them yet. Also, since you like in CA, you should probably go for the Comptech since they are C.A.R.B. approved. For the Type S, they'll give you 32hp to the wheels at the top end. Go check out www.comptechusa.com, I believe they have a dyno graph for the Type S, either a CL or a TL. I've had my Comptech headers since 1999, never regret about getting them. Plus, back in 1999, the price was $1500....