The real question is what size are the twin pipes coming out of the cats? Or is that one of them? That makes a HUGE difference. That would make the outlet cross section 6.283 sq. in. total , not 3.543
Quotes to live by:
guessing gets expensive
nothing is more expensive than a cheap BMW
buying a ratty example (of a BMW) is a parasitic relationship.(and you ain't the mosquito)
Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
1995 318is "Bebe"; 1993 325is "Elvira"; 1985 635CSi "Katja"; 1984 633CSi "Sylvia"; 1987 325is "Odette"
Last edited by hornhospital; 02-15-2013 at 04:22 PM.