i do the same thing before i drive down to FL. it stays clean on the trip, but a few days after returning, not so much.....sister in law uses it for her daycare vehicle.
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2003 Ford Expedition: 5.4L, harley supercharger, 6lb lower pully, c&l plenum, k&n cai awaiting install, LFP SBTB, FTSP, Magnaflow 3" catback, 2006 F150 20's, 2800 stall converter, Hawk brake pads, Drilled rotors, Eclipse AVN-5510, white face gauges, cobalt c2 boost gauge, 339 rwhp, 440 rwtq(dynoed with oem 17's)
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