Extreme Flight 110" YAK-54 V2, Assembly Manual

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14. The cowling is already drilled and the mounts are in place, to install simply
slide it onto the mounts and install the supplied 3mm bolts. However, with stock
mufflers you will need to cut holes in the bottom of the cowl to accommodate the
muffler outlets. Also the cowling needs to have the front baffle installed, I
recommend you trial fit the cowl and see where you will need to make holes for
the muffler downspouts first. Then install the front baffle. See figures 22 and 23
for how my muffler holes are cut.
Figure 22
Figure 23
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