hi there

i'm thing about putting a tune pipe on my GMS .76 i'm looking for top end like a prop jet plane can this motor work this way or just leave the stock pipe if so what fits the the GMS like on a GMS 1.2 it's the same as a webra 1.2 the .47 same as the os .46fx

one more thing what prop would work the best (or starting point )
with this motor with the pipe you rec.

thanks Guy

You will gain 1500 to 2500 rpm with a Mac's header and pipe on the .47. Mine will turn:
9x10 APC 13.65K
9x7 APC 16.3K
10x8 MA 14.5K
12.25x3.75 APC 12.4K (as fast as people are getting with their .50sx's)
11x5 MA 16.1K
14x6 MA 7K
9x7 APC 17K
The 9" props would be good for something 3# or less, otherwise go to a 10x8. Its hard to get it under 3#. Maybe get a Mag .91 with a 5# plane. The .91 only weighs ~8oz more.

how about a GMS .76 and what pipe fits the GMS .76

thanks Guy