Okay, i got my Honda Brio 1300 M/T last month. There's something makes me curious. I check some pictures of Honda Brio, and it has air tunnel under its hood (marked by red circle).
And, unfortunately, my Brio M/T doesn't have it. I made my research, and found out, that this air tunnel is only on Honda Brio A/T.
I haven't asked the dealer yet, but could you please tell me, does your Brio has this air tunnel on it? and please tell me your Brio's version.