you can lower your muffler by cutting your mounting bracket and welding lower by 1/2 to 3/4 of an inch. that might help clear your bumper bar. I did this to get clearance for my rear winch mount. make sure to loosen the clamp where the muffler goes into the mid-pipe. easy fix.

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2009 Polaris RZR 800, 2002 Ducati 998, 1998 Ducati 916, 1998 Ducati 748, 1995 Ninja ZX6R, 1990 Honda Hawk NT650, 2000 Kawasaki Bayou 220 2X4, 2001 Yamaha Breeze 125, 2002 Honda 300ex Sportrax, 2006 Polaris Hawkeye 300 4X4 (JUNK), 2000 Polaris Magnum 325 2X4, 2000 Honda Rancher ES 350 4X4, 2003 Harley Davidson, 2000 Buell Lightning X1
2-2003 Kawasaki Prairie 360 4X4's, 2000 Eton 50cc, 1988 Toyota 4 Runner,1984 Toyota 4 Runner,