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Old 02-15-2013, 11:01 AM
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HakenTT HakenTT is offline
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Location: Arizona
Join Date: Aug 2011
Posts: 261
Mein Auto: '91 E30
323ic single exhaust is not restrictive for 2.5L engine. It goes down to 2 1/4 inch in front of the converter, after the converter it goes to 2.5 inch wide pipe. 190 horsepower has no problem with 2 inch exhaust pipe.

328i and M3 mid section is worse. Right after converters the two small resonators, the pipe is only 1.5 inch wide inside on each side
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