^^Please do so. I have a crx and plan on doing the same thing. Just dont know what im getting myself into.

 

*sorry to threadjack*
Personally I'd love to see a CRX with an f20! I'm sure I'm not the only one. There are many build threads around here that only involve the S2000 drivetrain that are appreciated by most if not all.

 

here is a comparison between a 2.5" downpipe being replaced with a 3" downpipe, both on a 5 bolt t3 outlet flange. basically, how i do it is i take a 3" pipe, weld it onto the flange almost all the way around except near the 3 bolt holes that are close to the pipe. i throw it in my arbor press and use a rounded off punch to press the divot in the pipe to make clearance for the bolt head, then weld around it.