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Old 02-10-2010, 11:02 PM   #7
Edison@JleviSW
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Join Date: Apr 2002
Location: Santa Clara
Posts: 28,332
My Ride: BMW Duh
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I would do Active Autowerke. These are designed to give the car a deeper grumble but not be too loud for daily use or ruin the classic BMW sound.

Active Autowerke 323i/328i Exhaust

This is a 325 but will give you an idea:

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