I have a 2003 Coupe with the same motor. I have always heard a sound of the exhaust flowing along with the fuel pump. But since it is an SC'ed motor it will always sound diferent than a NA motor will. I also get the puff puff from the exhaust tip which is the same sound every Forced Induction car I have heard and driven has made..

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....