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We like quiet, so retained the factory exhaust system. The big OE muffler changes color because the JK runs so lean. The Kilby muffler skidplate not only keeps the muffler from being smashed flat on a rock, it also covers the unsightly discoloration that soon happens. The heavy-duty Dynatrac cover protects the 5.38 Yukon gears, OE E-Locker, and has a higher oil fill plug, needed with JKs (especially 2-doors) that have rotated the rear end for correct driveline angles.