I would expect 13 second laps flying a good course. Maybe 14 seconds here in the high desert. It would be cheaper to just add a Jett muffler to that AX55. Maybe you can borrow one from someone to try it out before you buy another engine. My flying partner was flying a stock AX55 on 30% in a World Models Voodoo and could easily break out. I think the T34 is sleeker than the Voodoo.