01BULLIT,
This is my first post here, but I post a bit over at IMBOC.com. I also have a Bullitt (4861) and just recently purchased a nitrous kit from JMSchip.com. It's a custom dry kit that is adjustable from 50-125hp and uses compucar components. The kit very complete and includes colder spark plugs and an Autologic chip with 4 programs on it (2 n/a, 2 n20). One of the reasons I went with the kit was for the custom chip (this is also how fuel is controlled on a dry kit for our cars).
I just recently had LT's, o/r H-pipe, 4.10gears, and densecharger installed on the car. The chip will correct the speedo and remove the check engine light from the lack of cats. God willing, the kit will arrive in two more days. After that, I plan on getting dyno numbers, both on and off the juice. Look for the post over on the bullitt website (imboc.com) next week.
Btw, the kit cost $800 all inclusive. Check them out at JMSchip.com. If you call them, ask for Monty or Chris.
Brgds,
-Tim