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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 06-18-2011, 03:31 PM
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Default Flowmaster performance

Anyone else feel like they lost some low end performance with a FM?

The truck doesn't seem as quick as when I had the stock exhaust. Maybe I've just gotten used to it.
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Old 06-18-2011, 03:34 PM
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Can't say that I have, actually to opposite. Seems quicker and the performance and MPG have both improved with the FM40.
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Old 06-18-2011, 04:32 PM
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thats weird but like you said you maybe use to it....i think its time for a programmer
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Old 07-10-2011, 05:14 PM
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I noticed a tiny loss with my Super 44. But a major improvement in my mid to highend! Now It pulls like a beast from 2500 to 5500 rpm. Rite where i need it!!
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Old 05-30-2012, 02:38 PM
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A year later and I still feel like my truck has less throttle response than before the FM 44.

Anyone else have similar experiences?
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Old 05-30-2012, 02:43 PM
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^was it just a muffler swap, or any other exhaust work done? Flowmasters are typically slightly better performing than stock, but not a huge improvement. If it was just a muffler swap, there's very little difference. Noticing a gain or loss is probably just placebo effect...
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Old 05-30-2012, 02:56 PM
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Just a muffler swap.

It could be my imagination but I might look into other setups.
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Old 05-30-2012, 02:57 PM
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I'm not a fan of FM, but if you just did a muffler swap(3" single in/3" single out, or 3" single in/2.5" or 2.25" dual out) then there's no way it's worse than stock. It's the same as stock or slightly better...
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Old 05-30-2012, 05:24 PM
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I went from a FM Super 44 to a 14" Magnaflow with Magnaflow Y-Pipe and can tell a big difference.
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Old 05-31-2012, 11:19 PM
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I've said this before..I try to tell people in their selection process not to go with flows unless it's purely for sound, not performance, and EVERYONE (including me) that I know of that have done flows have swapped them out for mags or any other muffler... I really wished there was someone like me when I was selecting my muffler but way back then there were no fast trucks yet, just loud trucks...
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