RE: Tuned pipe for a 46AX>>>>>>>>>>
How about a Jett tuned muffler. I gained 1,700 rpm on my OS .55 with an 11-6 APC. Try a 10-7 prop on the .46AX. For an FX or TT Pro 46, use a 9-7. The AX has more torque than those 2.
[link=http://www.jettengineering.com/]Jett Tuned Muffler[/link]