Thread: HFC High Flow Cats
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      07-24-2012, 09:27 AM   #3
jkrew
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Drives: 2007 328i Sedan
Join Date: Jul 2012
Location: Denver

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Quote:
Originally Posted by flinchy View Post
High flow cats won't do jack if the id of the pipes either side is still smaller/stock
Agreed. Plan on doing headers/exhaust as well.
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