The Monster can has the effect of slightly reducing the effective magnet strenght -vs- a P2K can... Using a P2K arm in the Monster can will translate into a motor with slightly more RPM than a true P2K and slightly less torque... Not necessarily noticable on the track, certainly no more than a 1 tooth pinion change from a true P2K...
As noted by an earlier post -- it will "work" just fine... It will also NOT be ROAR legal, as the ROAR rulebook would categorize the motor as a "hybrid", since the parts combination is not the configuration approved by ROAR...
"If you cannot win, make the one ahead of you break the record."
Biff Racing Team #420 (Ah... The "good old days"...)
The local indoor Offroad Track: The RC Race Barn
TLR22-3.0, TLR22T-2.0, TLR22SCT-1.0