haven't used one personally, but i've seen it in action on a 1st gen mr2 that was turbo'd. the guy that owns it is the local, and one of the very few ms dealers...nice guy. ms is a good stand alone for the $$ on cars other than honda's. unless they have conversion harnesses for specific vehicle applications you'll have to wire it in or make a plug and play harness yourself.

what car you planning on using it in?