SIR2 is a newer motor.

You obviously don't know what a built all motor setup is like, or you wouldn't make the comment you made seth. A built all motor setup is an extreme revver, super high compression, big cams, and lots of displacement. The higher you go in the rpms, the more stress you put on the rotating assembly and the cylinder walls. More stress means more heat, and more prone to breaking....boost doesn't necessarily mean breaking. The higher in the rpms you go, the more chance you have for stretching something and wearing a bearing. From someone who has built motors for both setups, trust me on this one. RPM = ruins peoples motors.....and I will never see it your way, because I've been in this game for way longer than you, and have way more experience.