I think the biggest you can get is the Greddy with a 60mm collector (about 2.36 inch, so bit over 2 1/4") or you can do like some people did, modify one.
Originally posted by Jape under wraps rofl.... Dont let the fedz or the domestic guys find out, they might come to your house and steal the flux capacitor.
pssh no I just have lots of friends that wanna know what I'm up too...
The Kamikaze header should have a 2.5'' collector. You might as well try it, its cheap. Its just hear say that it sucks for NA. A guy with a 4th gen VTEC at a meet I went to had it and loves it. I also heard him drive it and VTEC engagement sounds like that of a B18C5, it was pretty cool. Infact, I might even buy that header too for my NA buildup, at least to try it.
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