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Old 02-15-2013, 12:01 PM
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hornhospital hornhospital is offline
D'oh, You Kids!
Location: In the Grumpy Chair
Join Date: Jan 2008
Posts: 15,883
Mein Auto: 1995 318is / 1993 325is
I'll be damned. He's right (if his pipe size figures are right).

323 exhaust before cat= 3.976 sq. in. cross section
323 exhaust after cat= 4.908 sq. in. cross section
M3/328 exhaust after cat each= 1.767 x 2= 3.534 cross section total of two pipes.
Quotes to live by:
guessing gets expensive...drivinfaster
nothing is more expensive than a cheap BMW...c4harpe13
buying a ratty example (of a BMW) is a parasitic relationship.(and you ain't the mosquito) 7pilot

Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
BMW-CCA #441426
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"

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