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      02-27-2013, 02:08 PM   #45
Chriskm3
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      02-27-2013, 08:35 PM   #46
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Quote:

The catalytic converters are the main source of backpressure in the stock system
How do race m3s generate back pressure. Surely they don't run cats.
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      02-27-2013, 08:40 PM   #47
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Also if thats the case then why do some mufflers that reduce backpressure give you a torque dip at lower RPMs?
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      02-28-2013, 10:04 AM   #48
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Found this relating to back-pressure:

http://www.8thcivic.com/forums/bolt-...le-sticky.html
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