Hi the silencer insert on the 08 450 is stuck, i left it in from new and after 12months i repacked the muffler, now i am used to the power i was looking at removing it, but its locked in there. The allen head screw is poor quality and i cant get it to turn with out its stripping or just popping out when i turm the allen ket tool, i have tryed an oil based lub to assist but its has not worked, any ideas??