This is for a CBRf4i

I already did the clean air mod.. now the only thing I didn't do is the block off the two holes at the bottom of the air box. First I couldn't find a decent material to do so.. I actually wanted to use a semi pliable piece of rubber and then put metal clamps around. But the more I looked at it.. I couldn't even decipher the purpose?

By blocking off are you absolutely forcing all air into the engine? I'm not sure how the air would even enter those wholes unless there was some very strong suction created.