The amount of firepower and horsepower on this relatively small plane is astounding. It may not have been able to carry much ammo, but still this would have been one heck of an adversary if Japan had produced it in numbers. Even jet fighters would have steered clear of it.

The large size of the turbo doesn't indicate it's powerful but rather that the Japanese were unable to build a compact turbocompressor like on the P-47. Also the Germans had problems with building one (see Fw 190 Kangaru version)

Better turbo placement than on the P-47, sort of like the Lightning.
The "Jug" had its turbo and intercooler inside rear fuse, so lots of ducting going back and forth under the pilot, with heat insulation, etc. Just made it fatter.

Look at the turbo! This little number would've spelled trouble for Allied bombers...and the odd P-47...looks like a very meaty fighter.