I had the extreme flow exhaust and intake put in my 04. After one year of lackluster performance flat spots, etc I took it into the dealership. They took thermal readings at the intake of the muffler and found that it was 500 degrees on one pipe and 250 on the other. It appeared that the muffler was not flowing well at all. They were nice enough to put the factory exhaust back on and I have never been happier. I dont even miss the louder exhaust as it proved embarrassing with guests in the car when the truck was all bark and no bite. I have since resigned myself to the best performance dollar seems to be the supercharger. Good luck.
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2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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