Get a Hondata IMG, or a knockoff (Corsport, Nextgear, etc.). It's only $50 or so, and you're already disassembling the entire intake assembly.

If you go with the 3.8" pulley I strongly suggest getting a professional tune.

Quote Originally Posted by Unknownally View Post
I would get the boost guage to check if the belt slips and if you aren't getting the right amount of boost.
This is the only gauge I'd consider necessary. Belt tension can be very finicky, and since each person's setup is different, you have to tweak the belt tension and watch your boost to find the optimal setting. I also find the boost gauge handy because it helps me stay out of boost during normal driving. The bypass valve doesn't start closing off until 6-8 mmHg of vacuum, so if you keep your throttle below that you'll stay in the leaner portion of the fuel maps and get much better gas mileage.