Check your exhaust clamps just upstream of the muffler. I took delivery of my 04 and noticed black soot and burn mark on the underbody. With the engine running I could feel the exhaust seeping out. Just tightened them up and all was good.
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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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