im in the process of buying a b18ft t2 unit off haz as my old one is shot, i want to upgrade the t2 turbo and from what ive read there is no strait swap upgrade, so, if i buy the t2 can i get a t25 compressor housing and the t25 compressor wheel and bolt it staight onto the t2 core and shaft as i heard they were the same??see the thing is i want to retain the original volvo exhaust housing and downpipe. Any help appreciated. Tim