Join Date: Oct 2009
Location: Cowan, TN
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Exhaust Mods; Increased MPG
I thought I'd share this info. This past weekend I removed my catalytic converter (no inspection in my county) and muffler from my truck. It's a 2004 F350 CC 4X4 dually. It had an aftermarket 4" exhaust from the catalytic converter back to the tailpipe. It is 3.5" from the turbo to the cat. I unbolted the cat, and cut the inlet flange end off. I welded this flange end to a piece of 4" straight pipe I bought from a muffler shop. The straight pipe is 5 feet long. I turned it out in front of the rear tire at an angle. I used the piece of tail pipe that goes up and over the rear axle to make my 60 degree turn out in front of the tire. I welded it up, and put a 5" chrome tip on it for looks too.
I noticed that the hissing sound is a lot more pronounced now. It has a nice growl at low RPM too. At WOT it sounds like a damn beast.
My MPG increased too. From 14.5 to 16.5 in the city and from 16 to 19 on the highway.
2004 F350 4x4 Dually King Ranch