i have a p5xlt currently ..it has been gone through by a buddy of mine here locally ..he said that the novas sometimes come some left over machine dust ....and that there can be burrs in places where the key parts all fit together (true of most engines he says )...i think the maxpower have been gone through and deburred and fited ...just what ive heard ..so if that is the case you could say that its better than a p5