So if the mid-pipe doesnt't come with the tube for smog...

My summit H came with one....I've seen some people just clamp it off......you can always drill and tap one in and create the tubing to tie into.....depends on how much you want it.......

most seem to come with one but still arent a perfect fit by any means

iv just plugged or just left it but ,they can be noisy from air

Yep, they often have a bung. If not, I would not plug the line from the smog pump if your pump is going to continue to be spun. It does build decent pressure. I'd plug the end of it to keep crap out. Then undo the rubber line at the TAB (since it's up relatively high). That way the pump can vent to atmosphere. If it was me, I'd also put a breather on the end of the line to keep crap out of the line. If water backfeeds into the pump, the bearings and bushings in the pump can corrode. Then the pump is junk.

Good luck.