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only difference with OEM "sports muffler" is cosmetic

1402 Views 11 Replies 4 Participants Last post by  31st330i

I finally got an answer to this thanks to my local parts manager who called BMW (and I suppose spoke with the district parts manager or a deligate).

apparently the sports muffler has black tips and costs $5 more - that's it.

Fred Meloan did tell me (after checking with his parts guy) that all US cars already have the sports muffler but this didn't jive with me since the ETK showed that there were two additional parts required, a vacuum plug and a tie strap.

so now we know.

oh well, at least the OEM muffler is already a straight through design.

okay, so now I'm thinking about removing the resonator or replacing it with the supersprint straight through resonator.
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Ive always been curious about the exhaust valve thing. I think the sound of the exhaust with holes open is too boomy and tiresome, not sporting in any way, just horribly boomy, and also creates significant resonance in the cabin which detracts from the engines smoothness. I was wondering if there was any way to remedy this (keep valve closed??), and not loose any power/torque. Does the mechanism work in any way to improve power, or is it purely for acoustic purposes.

thanks in advance.
and also, is the OEM muffler just a dummy box with straight pipes going strait through, i.e. there is no sliencing effect at all from the back box??

thanks again.
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