I have been looking into IRS for a while now and one of the coolest (definitely not the cheapest @ $8000) ways to do it is with the Heidts bolt-in IRS.
There's a hell of a lot less hassle involved and it just looks bitchin'. Watch the video they have on it in a Camaro running an autocross coarse. Here's the link:
https://www.youtube.com/watch?v=ybODyxYpF9g
also the main site link:
http://www.heidts.com/6769_camaro_re...uspension.html