First NOS and NX make great wet kits for the H22. The zex kit is OK because it's the easiest to install Venom is computer controlled which I don't really trust.

Second the H22 is good to a 75 shot on stock internals but you will need to run colder plugs and retard your timing a degree or two.

Last, the gains are the best for the buck. I personally went from a all motor best of a 14.7 @ 93 mph to a best 0f 13.7 @ 98 mph on a 50 shot wet NX Zex plugs and no timing retard.

Preludeonline.com has a great N20 forum you should check it out.