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Old 08-10-2009, 01:37 PM   #4
AdamBath
Registered User
 
Join Date: May 2007
Location: Plano, TX
Posts: 3,086
My Ride: E30
Where are you getting your numbers from? 1.5" piping on a ZHP? I thought it was 2" ID piping, and I thought the midpipe on the 323/328 was 3"? The ZHP muffler also isn't a higher performing muffler, it may sound a little bit different, but it seems like you're going through a lot of work for a nominal at best change in tone.
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