lost mpg after dual exhaust

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Mar 25, 2007 | 03:31 PM

tec06

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Joined: Mar 2007

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From: Southeast

lost mpg after dual exhaust

After installing true dual fl mstr 40s w/ x-pipe mpg went from close to 17 to barely 16. Shouldn't mpg increase w/ dual exhaust? any suggestions? this is on a 5.4 engine

Last edited by tec06; Mar 25, 2007 at 11:10 PM.

Mar 25, 2007 | 04:08 PM

glc

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From: Joplin MO

You sure you aren't just getting on it harder to hear the noise?

Mar 25, 2007 | 04:27 PM

tec06

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From: Southeast

i've tried being easy on the gas and it still doesn't help, also when passing someone and shifting down i get some black smoke.

Mar 25, 2007 | 04:31 PM

expy03

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From: Texas in the heart

Black smoke is not good. You may have a sticking injector, or some other problem.

I'd get that checked out first.

Mar 25, 2007 | 04:32 PM

FX4 Matt

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Joined: Feb 2005

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From: Cape Cod, Ma

The slowmasters at work. the 40 series if for noise only thats all you gain is sound. if you wanted a performance muffler should have went with a Magnaflow.