I have a Model Tech Magic with a T.T. PRO 46. I am running an APC 11-4 prop with a Mac's muffled tunes pipe using Omega 15 % nitro 2 cycle fuel. I added a head gasket to the engine and I am running a K&B non idle bar long glow plug. I have a slight hesitation in the midrange that I can't tune out and it is just enough to mess me up when trying to torque roll. I am turning 15.000 rpm with this set up. I think the problem might be the glow plug. Anybody out there have any glow plug info about this engine and pipe combo. With 2 cycle engines with stock mufflers I usually go to an O.S. 8 PLUG and it solves most problems. I wonder if this plug will stand up to a piped engine. I have played with the low end adjustment till I am blue in the face and I still can't get it right.