hi,I'm italian ..what do you think about lohen performance head with schrick enlarged exhaust & inlet valve ?I want to know how much hp this lohen head increases rather than jcw head,and which is the different performance between rmw jesus head and lohen step2 head ?

The performance differences between the two heads is probably not that big if you use all the same exact mods (cam,intake etc). RMW does have some proven records with thier head though, so that is something to consider as well, not sure if Lohen does.