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      02-14-2008, 06:10 PM   #5

Drives: 335i coupe
Join Date: Nov 2007
Location: G hills

Posts: 551
iTrader: (2)

what kind of piping do you have now?

I was told by a guy who is really good with exhausts that removing the secondary cats and putting in x pipes is the way to go. Also seen it backed up here on the forums.