And, the 2.1L is made for the PI. You may have to convert to the PI heads. The full kit is about 5K. But it comes with EVERYTHING. As long as you are dropping 5k on a supercharger, you might as well spend the 400$ to get a set of PI heads and cams anyway. You should be able to find someone willing to give em up for that. And its good for 50hp on top of the power the KB will give.
I don't understand where to confusion is on their site. If you click on superchargers link, there is a link to the 2.1L Kit for the 96-98. The 2.1L 99-04 and the 2.6L for the 99-04. What is confusing about that?
They are made for the PI, and the NPI... How am I contradicting my self by saying it is made for the PI? You can do it with either. Do you mean I said it was Designed for the PI or something? and that you HAVE to swap to the PI heads? I said you MAY have to swap. I hadn't looked at their site in several months, but in looking back at it I saw it is the same, you can do it with either. My previous statement still stands tho, if you would just go look at the web site, all the questions about what it works with could have been answered. Including my own uncertainty, which is why I posted again with the correct info.