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      02-01-2013, 08:55 PM   #27
pbonsalb
Lieutenant Colonel
21

 
Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH


Posts: 1,719
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Most are 2.5 inch. Dinan uses and uncommon size for exhausts, 2.75. For a naturally aspirated car, 2.5 is fine. For a supercharged car making 600 rwhp, I would prefer larger than twin 2.5.