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06-20-2012, 10:53 PM
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Drives: 2010 Prius, 2007 Yaris Sedan Join Date: Oct 2009
Location: Ocala Florida
Posts: 368
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header vs muffler
I'm looking into an exhaust.... I have a 2007 sedan, and I wonder if either header or muffler will affect MPG either positively or negatively, assuming driving conditions and styles are the same?
I'm looking at probably the weapon r 4-2-1 header, and haven't really decided on a muffler... I have noticed a MPG increase with an Injen CAI though...but I want to keep upping it :-) any advice?
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