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does BACK-PRESSURE increase MPG vs straight thru...

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04-27-2009, 01:30 PM	#1
marcus toyota View User's Garage Drives: 2007 Yaris RS Blazed Join Date: Oct 2006 Location: toronto, canada Posts: 3,637	does BACK-PRESSURE increase MPG vs straight thru... thinking of straight thru muffler but stock pipes..worried about drop in mpg. anyone???????????

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