Focus Fanatics - View Single Post - Basic Bolt Ons: Cat back exhaust systems
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Old 03-21-2009, 11:55 AM   #8
honhon
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Quote:
Originally Posted by 1-ST View Post
No, but it is generally recommended. It will "get used to it" faster if you do. Otherwise, it may run somewhat less than ideal for the first tank of gas or so.
the PCM doesnt monitor the exhaust system, so its not going to matter.
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