I would think that the vertical performance with an OS46 would be outta site. Ive just got a TT.42GP plain bearing/air bleed carb motor on mine with a mousse can pipe and its pulls out super strong!!!! Ive ven had people ask me if thats a .53 or something. I say no........just an extremely light plane....and a mousse can baby!!!!!

But I cant imagine a OS46 not pulling even harder even with a stock muffler!?!?!?!?