Some h22s just are stronger from the factory, they are one of the widest ranged factory whp dynoed engines from honda. the h22 I swap in could dyno at 165whp bone stock whereas my friends stock h22a could dyno 175whp, then not to mention they respond differently to mods.

The V2 intake isn't anything special IMHO. It sacrifices low end power for slightly better high end. Since I had my factory intake and swapped to an AEM SRI (Garbage) I lost alot of power prior to 3.5k rpms (h23a1) but gained a good bit from 4.5-5.5k.
Pulleys will net you maybe 5-6whp. Maybe
Exhaust never really makes a difference in hp unless you have a good bit of mods. But I can't see it hurting you much if it at all.