I am using an O.S. header and flex pipe on my Great Escape. Both pieces should be available from Tower Hobbies. Let me know if you are interested and I'll do a little digging to get O.S. part numbers or Tower stock numbers.

The only hard part would be to find a silencer to fit on the end. The silencer I'm using is an old O.S. silencer which (to the best of my knowledge) is no longer available.

An easy cure for this whole setup would be to use an Hatori exhaust header (the one for the Y.S. 63) fits the O.S. 91 perfectly along with a MACS pipe. I purchased this setup as well, for my next 91 Surpass powered pattern bird. I don't have personal experience with it, but is has been said its a nice quiet setup. Once again, specific part numbers available on request.

Yes,... the flex header and pipe do NOT add anything to the performance of the engine it just makes it very quiet and keeps all the exhaust and fuel residue aft of the wheel wells and retract mechanism.

Signed,
Steve T.