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Old 09-07-2005, 14:30   #4
vart
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Join Date: Feb 2000
Location: Palouse, WA
Posts: 17,522


I replaced my factory muffler on my `99 F150 4x4 ext cab 5.4 V8 with a Flowmaster 40-series.
That and a K&N filter w/ a modified stock air box netted me a best of 18.7 mpg hwy and some city driving.

It sounded very nice; throaty and noticeable, but not too loud.
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