We have the 26 and the 40 and they are very good engines. I'm just getting ready to buy one of the new MT 52 Pro engines from Adam for my new 30%. Their price is great and so is their perfomance. 21 pounds of thrust from the 40 with a Xoar 20x8. The new Pro line should be great. You can use the tuned pipes and cans from the DA on their MT 52 Pro and it's putting out 28 pounds of thrust with the muffler that comes with it. For $475 complete with muffler, EI, and stand-offs I don't think you can beat it.

Hey Bubba! They just put out a 100cc twin also for $825.