Going to have to do some drilling and tapping to make it work, and will need some additional components as well...the heads from all the inline 6 of that era had similiar casting, which is a double edge sword for me. Great for compatibility, but the combustion chambers are the same, so that means compression ratio will be unchanged. But, I'm trying to find a thinner head gasket; that will give me a little boost in C/R if I can get hold of that. The M3 (VANOS) cams have 20* more duration, but slightly less lift. One of the advantages will be that I can advance the timing more with the VANOS setup, but I dont think that the W.A.R. chip will let me adjust when the cams kick in. But it's a trade off that I'm okay with, since I can create custom fuel maps, etc., each time I install a new add on. I really am thinking hard about going with a supercharger. Don't need (or want) a high boost setup, just want a nice kick in the rear in low- and mid- range...and thats where these things need it most. Acceleration out on the highway is nice, once at speed...downshift at 70 then floor it is a barrel of monkeys, lol...but from a stop, or pulling out of low speed turns, the motor is nothing special. Have you had any projects prior to the Xterra? I'm a Nissan guy, but don't know very much about the X's.