have a couple of questions, and the search does not really help.

1. What is the difference between the b18a, and the b18b
2. Is the first b18a called the b18a1 (130hp)
3. Greddy has an exhaust for the b18a GS version. Do they really mean that its for the Non-vtec cars when they say GS?
4. WIll the greddy turbo kit for the b18b engines fit on a 93 b18a (or is it B?) integra.
5. What year did the b18b start?
I searched on Honda-Acura.net, and there is so many different answers. Some say the b18a is 90-91, and the b18b started at 1992, and up, others say that the b18a is 90-93, and the b18b is 94 and up. This is really confusing. I am getting a 93 Acura Integra 5 speed ls next week, when I sell my Jetta, and I have a lot in mind for the car. Thank You