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highflow cat, midpipe mpg?

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Old 01-22-2006, 11:40 PM
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highflow cat, midpipe mpg?
does the highflow cat and midpipe decrease the mpg? i have a high flow cat and my mpg seems like it decreased but i wasnt sure if that was the case. anyone tell me the science behind this if this is the case?
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Old 01-23-2006, 02:18 PM
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if you are driving harder after the install yes it will decrease. other than that no it should not.

went from a stock cat to a mid pipe, no change.

beers
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Old 01-23-2006, 04:43 PM
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Science: Any bolt on mods need to be tuned to get the best performance
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Old 02-17-2006, 04:10 AM
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the funny thing is when i was stock i was shifting at 5k driving at 4 and now i shift at 3500-4000 and get lower mpg lol.....
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Old 02-17-2006, 09:03 AM
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since mpg occurs at low rpm/flow rates why do you think it would change?

A high flow cat mostly impacts the mid-high rpm powerband
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Just wondering is this true.



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