View Single Post
  #18  
Old 02-15-2013, 05:31 PM
ZeGerman's Avatar
ZeGerman ZeGerman is offline
Warm Leatherette
Location: Seattle, WA
 
Join Date: Mar 2009
Posts: 19,544
Mein Auto: 1998 BMW 328is
Yeah, it doesn't make sense. Everybody reports power gains with the 328/M3 mid-pipes and cat backs over the 323 units. Haken is literally the only person I've ever heard say that the 323 exhaust is better. His claim doesn't add up, nor should it. BMW would never put a more restrictive exhaust on their higher performing models.

Also, how is cross section different than area? I'm assuming that the terms are not synonyms, but when I calculated the are using Pi*radius squared, it produced the same numbers as your cross section figures. Sorry for being dense...

EDIT: That makes much more sense! Haken said the 328 pipes were 1.5" each, but those photos are showing that they're much bigger than that. I think he was suggesting that they're double-walled, and that the inner pipe is only 1.5" in diameter, but that's not what we're seeing in the photos.
__________________

1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
View my photos: Caught in the Wild
For sale: E30/E36 front sway links
For sale: OEM E36 328 catback

Last edited by ZeGerman; 02-15-2013 at 05:42 PM.
Reply With Quote