I use the 0,86 housing and i have full boost at around3500 rpm. But i,ve had some problems with surge, so we have ported the exhaust housing for this year, and that will make it slightly slower on response, around 3-400 rpm. I have been running with this turbo since 2000, so it,s been going for a while, and there was no problem with it when we checked tis winter. You need an adaptor plate to fit the standard manifold.