4in downpipe????
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Mountain Pass
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From: RGV,TX
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From: Dunwoody, GA
I find it hard to believe a jump in mileage is gained from an exhaust.
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From: Parkersburg
When I removed the cat off of my 03 S/D (5.4) I jumped a little over 1 MPG. I have driven my 06 now for about 50 miles since I put the exhaust on and my lieometer picked up .9 MPG so far. I don't have any real world mileage numbers yet though.
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From: Dunwoody, GA
That's a gasser not a diesel. Most people who claim mpg #s don't have any hard numbers / facts to back it up or are calculating using the lie-o-meter and less than a tank of fuel. 5 tanks of fuel before the mod and 5 tanks after would be enough to show any gain or loss.