Whats required to install the WR426 5th into a 02 YZ426? I have the input and output 5th gear set for a WR. Other than the required gaskets and a possible piston and rings. (its a pretty low hour bike, I havent ridden it since 05 and only rode it about half a season prior.) Im thinking of turning it into a dualsport. Already have the Eline coil, 18" rim and revalved suspension, big tank etc. Also, can a stock WR muffler work w/o to much trouble? I want it very quiet, stock DRZ quiet if possible. Has anyone tried those Pro Moto Billet quiet core inserts for the stock pipe? Are they comparable to a FMF Q?