In my opinion, there isn't an "off the shelf" supercharger kit for the b-series that's worth it.

As said above, the old roots type JRSC kits are highly inefficient and produce high IAT's which need the aid of either an LHT intercooler or water injection to run desirably. Increasing boost on them yeilds diminishing returns to power, with excessively high heat being the by-product (especially at high RPM's). Saying that, they do make a good basic power adder if boost is kept under 9-10psi, but their potential is limited on our engines.

Becuase of the above, a mate of mine in the UK tried a Vortech S/C kit on his b18c. As i've said in another thread somewhere, it produced nothing but headaches for him. When it did run without any issues, it produced a nice linear power boost. But the mechanism was a pain to install, it snapped three belts in three months, and the final result wasn't particularly spectacular. There was a noticably decrease in torque and power up to 3500-4000 rpm, which is not desirably on a daily driver. Essentially, this application wasn't right for his needs.

I reckon ewendc2r is on the right track. The rotrex system is small, compact and efficient and able to be intercooled - it's a step above in terms of technology against previous designs. But it requires a lot of custom work to fit. Saying that, there is a video of an ITR on youtube with a rotrex system (search "integra rotrex") - looks like a fun setup.