Do you happen to remember how high his top end was? Im looking to have max 5500rpm, you dont think 2 ported m90s with a 3.4 pulley would get it done? Adding more superchargers starts to complicate things. Like was said above u run into drive issues. I feel 2 running on 1 belt is pushing it already. As for an intercooler, i dont understand how it would work with the supercharger, bein mounted straight to top of engine