If you have to buy a new drum anyway and if it's the same for the blast as for the rigid mount XL or the Buell tubers, why don't you upgrade to the Baker smooth shifter drum?
There is no big difference in prices,but in shifting.
Engine related performance and reliability upgrades I did on my M2
1250cc kit by RevPerf
Stage 1 heads(M-Tek),
Hydro Rev roller rockers
536 SE cams
Beryllium bronce oil pump drive gear (essential for engine┤s survival)
Cutted camcover/oilpump drive gear spy hole
adjustable pushrods/matching covers
XB rockerbox cover conversion
Buell race AC or Forcewinder
HSR 42,(30/170),Yost Power Tube
Buell Pro Series header/muffler
Andrews gears for 1st and 4th
Lightened engine sprocket
Energy One clutch kit
"Stenzel StŘtze", genius reinforcement bar, respectively release of front motor
mount,(essential for the survival of the front head)
Billet front motor mount(Billet 4 race).