in all honesty there isn't a reliability issue with the pro motor, this forum is a joke how much it blows it out of proportion. in three years of selling pros 100+ per year we have had 3 go down, all close in vin numbers all 11's and all with lower pto rod bearing failures.
i put kelsey's kit in for extra power, his kit stacked with a stage 2 should give more low end grunt and smooth power all the way through the power band. have 2 stage 4 slp kits, a couple stage 2's, a few stock ones and a a couple with just the drop in kit. should be able to get a pretty reasonable comparison out of the bunch