Great Planes Giant Citabria 30cc/EP ARF - GPMA1435 - Manual (Page 27)

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9. We have shown the installation of the DLE stock
muffler. Doing so will require you to cut more of the cowl
away than you may like. A Pitts style muffler will be a more
compact installation and require less of the cowl away. If you
will be installing a Pitts style muffler you will need make a
modification to the firewall shown in the next step.
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10. Locate the plywood plate shown here. Screw it in place
as shown. This will allow the spark plug lead and the ignition
lead to be routed clear of the muffler.
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11. Install the muffler of your choice.
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12. Slide the cowl onto the front of the fuselage. Work
slowly and mark where the cowl needs to be cut to allow it to
fit completely over the engine. Continue until the cowl will slip
over the engine and can be bolted to the firewall.
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13. Once you have successfully mounted the cowl, make
any additional modifications to the cut outs in the cowl.
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14. Make two holes in the cowl for the fuel fill line and the
vent line.