Great Planes Reactor Biplane .61 GP/EP ARF - GPMA1023 - Manual (Page 21)

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13. Same as when cutting holes for the engine, when
cutting holes for the muffl er, start small, test-fi t the cowl, then
continue to mark, cut and fi t the cowl as necessary until you
can get it into position. In the case of the O.S. .91 4-stroke
with the 90-degree exhaust header, you can mount the cowl
with the header pipe already mounted to the engine, then
install the muffl er with the stock header pipe after mounting
the cowl.
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14. Cut any other holes in the cowl necessary for the
needle valve, engine cooling, glow plug, etc. For the needle
valve, it is convenient to use a paper template.
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15. If you haven’t already done so (and if using a glow
engine), connect the fuel lines—there should be one line
that connects the vent (on the top of the tank) to the pressure
fi tting on the muffl er, another line connecting the tank to the
carburetor and a third line for fueling/defueling. Close the
fueling line (which can be reached through the bottom of the
cowl for fueling and defueling) with an included aluminum
fuel line plug.