Quote:
Originally Posted by BMWX54.4
Sunday i put the Straight pipes inside and the first week i got kinda annoyed. It draws so much attention and It KILLS gas. I put $20 and it doesnt even give me a 1/2 of a tank. Before i know it that $20 is gone. How does the X-Pipe do???
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Not sure how exhaust pressure released kills gas mileage, might be your foot on the gas to hear it 
Change of exhaust has nearly no effect on mpg, especially if you are making it MORE free flowing.
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