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Old 08-10-2009, 03:03 PM   #6
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Join Date: May 2007
Location: Plano, TX
Posts: 3,086
My Ride: E30

This mentions 50mm, which, when converted to inches, is 1.96", or 2" for convenience in the States for thr 325/330/ZHP...

This mentions 65mm, which, when converted to inches, is 2.5, so you're right there about the 323/328.

Do you have emissions testing in Ohio? If not, consider headers. They will give a great tone(IMO), give nice performance gains, and you won't have to hack anything up or weld anything.
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