Focus Fanatics - View Single Post - Basic Bolt Ons: Cat back exhaust systems
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Old 12-27-2012, 01:28 PM   #158
dooor
Focus Enthusiast
 
Join Date: Nov 2007
Fan#: 51395
Location: Bakersfield, Ca., United States
What I Drive: 2007 se stick

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Will a 2.25" catback system on a stock 2.0 improve fuel m.p.g.? What other bolt-ons help m.p.g.? I live in Cali., a b____h of a smog inspection state.
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