Yea I mean locally I don’t think anyone would really have a problem with the rad. Way down the road if you were to goto a national event yea then you would have a problem, but I doubt that kinda stuff is on your list right now.
Intake manifold is a big deal because of the amount of things you can do with it. Change design to improve flow, switch over to ITB’s like dyingwish is, or just add a bigger throttle body. Not to mention that also opens up the fuel system so you can toy with that also. I should mention ECU tuning (in a NA powered car) is open from the ST classes on up.
I should have paid attention to your integra more, I have a 91 
Yea the power belts do suck. Seriously if I was going to campaign mine more actively I’d probably add in some harness right off the bat.