Wingspan99 and I got some great tach and tuning info on my TT36 heli motor at lunch. I have an 8.5oz Rave mousse can, with a 1 1/2 inlet pipe (only goes into the can about 1/4 inch). The macs header is full length. Has a 5/16" stinger that extends straight out the rear of the pipe (curved neck at the rear of the plane)

Stock heli pipe was consistently turning 12-12.3 k.

Mousse can pipe was yielding 14k consistent with a peak of 14.3k, with awesome transition. Odd thing was that I had too much muffler pressure under full throttle, and was leaning the engine out to the point of flameout. Running no pressure, it is great in any attitude.

Now I just have to figure out which can to run on my OS91 fx. I have the header and a large volume (16 oz hairspray) metallic red can, but I'm not sure if I could handle the ribbing that the "BIG SEXY HAIR" can will bring.

Any well stocked hobby shop should carry the aluminum tubing. It is significantly lighter than the copper. Give it a shot mgrambling.

Steve