Something seems odd to me about that muffler box. Judging by the diameter of the hole I fell like they may have been enlarged at some point putting them very close to the edge with little to no material left to support the box. I could swear the holes on mine are smaller and a little further in.
Edit: it also appears you are missing the tin that covers the cylinder head. Without it the air will probably just blow right over the muffler box rather than through it.
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