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I have a 6.0, and I just put new dual exhaust 2 weeks ago. I picked up the truck and drove around for about 2 hours loving the sweet new sound of my truck. When I got home my sparkling stainless pipes had black soot all on the inside. Wiped it out and it was clean. I have repeated this process every single time I have drove my truck and there is a slight black buildup that won't come off with just a rag, maybe need a solvent or something but I havent bothered. Anyway, I dont think there is any way of avoiding soot on the exhaust pipes, so I have recently switched to just keeping the outside of the tips clean, not the inside. I wouldnt worry as long as you arent seeing excessive smoking or experiencing any power loss. I think diesel and soot go hand-in-hand.
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2003 F-250 XLT FX4 6.0l powerstroke turbo diesel, supercab, shortbox, torqushift 5spd auto. Procomp 4" lift with dual shocks and steering stabilizers, 315-75-16R Toyo Open Country MT tires on 16x10 American Eagle Wheels, Edge Evolution tuner, Airaid intake, Magnaflow performance 4" turbo back dual exhaust with 5" dual wall tips, WARN Premium manual locking hubs, Bushwacker fender flares, Smoked cab and 3rd brake light, Aftermarket headlights, tail lights and reverse lights, TomTom GO 920 Navigation system, Ford custom seat covers, Lund tonneau cover.
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