2011 Arctic Cat 450XC Service Manual, Page 120Get this manual
3Place the gas tank cover into position and secure with the existing hardware; then install the two cap screws securing the rear of the panel to the frameTighten all cap screws and fasteners securely4Install the side panels and secure with the four reinstallable rivets; then install the seat Exhaust System
REMOVING MUFFLER
1Remove the two exhaust springs at the muffler exhaust pipe juncture
KC467A KC170
2Slide the muffler rearward to clear the mounting lugs and remove the mufflerAccount for grafoil sealINSPECTING MUFFLER
NOTE: Whenever part is worn excessively, cracked, or damaged in any way, replacement is necessary