Focus Fanatics - View Single Post - Basic Bolt Ons: Cat back exhaust systems
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Old 03-20-2009, 10:33 PM   #5
1-ST
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Join Date: Jan 2008
Fan#: 53127
Location: Birmingham-ish, AL
What I Drive: 2005 Liquid Grey ZX4 ST

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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.
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focus in storage. hit a rock with the oil filter and locked it up.
gotta sort out a 351w 4 door fox first, then the focus gets a 2.5
commuting with a v6 5 speed mazda 6 wagon.
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