Is there such a thing as an ARF without wrinkles? All the ones I have bought came complete with wrinkles.

MACS sells a tuned pipe header combo for the TT46 and 40. I ran one on the 40 with an 8x8 prop and some other engine mods and got 18,500 rpm on the ground.

Attach is a photo of the plane I had it on, it is scratch built and was not quite finished when the photo was taken. We estimated its speed at 140 mph.