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Old 08-10-2009, 01:43 PM   #5
TiAgTouring
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Join Date: Jul 2007
Location: Boston MA
Posts: 1,584
My Ride: has a D-Pillar
From what Ive read,

323/328 is twin 2.25 inch pipes til 1st resonator, then single 2.5 inch pipe the rest of the way

325/330/ZHP is twin 1.5 inch pipes from cats all the way back. Everything I've read says this is soo much better than single 2.5 inch pipe, and is a much better design

You are right that Im not going to be getting amazing gains or a huge change in tone/ volume, but I just want a little bit (can't be too loud b/c of where I live). I am also looking for a cost-effective solution, and don't want to spend much over $300 for parts AND labor.

Ideas or thoughts? Thanks
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Sold but missed: 323iT 5MT ZSP/ M54B30 Manifold Swap/ F1 Headers + Full ZHP Exhaust/ UUC SSK + DSSR

Current: Eurospec imported 2003 330XI 6MT
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