BMW M3 Forum (E90 E92) - View Single Post - Does any one replace their primary cats with high flow primary cats? especially s/c'd

wyatth · 05-14-2020, 07:05 PM

Supposedly the Fabspeed cats scrape since they are round and in the primary spot. The primary spot really needs a pancake shaped cat, otherwise it'd either scrape or be too small to be that effective.

05-14-2020, 07:05 PM	#24
wyatth Colonel 3549 Rep 2,824 Posts Drives: E90 ZCP Join Date: Dec 2007 Location: Bay Area iTrader: (0)	Supposedly the Fabspeed cats scrape since they are round and in the primary spot. The primary spot really needs a pancake shaped cat, otherwise it'd either scrape or be too small to be that effective.
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