I used the 89.5 myself , but I have underdrive pulleys and routed the belt per what some of these guys have posted in the past. Belt seems to fit fine.
In regards to the EGR, I really didnt notice any performance gains, I just figured, hell, since I dont have CATS anyways, why have all the smog stuff on there. It is amazing how easy it is to access the plugs on that side of the engine now. Nothing bad as a result of taking it off either, car runs great. I thought about doing the JB weld thing for the headers, but figured I would try to keep everything available to be put back on the car in case we ever get emissions testing around me.