Neu 1515 motors (castle 2200kv motor is based on this one) are rated at up to 2700W (for 30sek). While driving my truggy with agressive gearing and 10s A123 i measured short bursts between 2200-2700W. This is the power In ... Assuming an overall system efficiency of 75% which translates to 2KW or 2,72 HP power out of my system.
Typical .21 to .32 nitro motors hardly ever reach 2hp if you look at dyno graphs:
ebmods,
Nitrodynesystems or
abmods.
Depending on the batteries you use i would say that you can get more power out of a Castle 2200kv when compared to a good .28. Due to instant torque from 0rpm on it feels even more powerfull.