LB7 is 300 hp (injector issues, but there are upgraded replacements;5 speed trans)

LLY is 310 hp ( some over heating issues that upgrades can resolve, some say is a detuned LBZ;5 speed trans)

LBZ is 360 hp (great and modded easily;6 speed trans)

LMM is 365 hp (great, but has the dpf but mods bring out its true potential, pistons may not handle extreme hp very well 600+hp;6 speed trans)