All these OS engines have the same bolt pattern for the muffler . . . . .
.10FP, .10FP-B, .10FP-BX, .10FP-S, .12CZ-1, .12CZ-2, .12CZ-R, .12CZ-Z, .15FP, .15FP-S,

Turn the muffler 90 degrees http://www2.towerhobbies.com/cgi-bin...?&I=LXCA87&P=Z

Extend the muffler out from the engine http://www2.towerhobbies.com/cgi-bin...?&I=LXCA84&P=Z

You can get a tuned pipe from MACS but they cost 2 or 3 times what your engine did

http://www.macspro.com/headers_side.asp

Plane Jim . . . .

You made a post right after this one but due to some work on the database of the system your post dropped by the wayside but I read it and you are welcome.