I know the T25 will not fit, Well not a DSM T25, I am not sure about the Nissan T25? Or T28? If I were you I would go to Honda-tech.com, and go to the for sale forum and post a WTB thread, for a Greddy 18g turbo. It will fit, but will not be A/C compatible, I know I did it to my 1990 Honda civic si when my Sohc greddy turbo died. You will have to use the 18G downpipe that comes off the turbo. The 15G one wont work.

The 18G is a hell of a better turbo than the 15g that the SOHC greddy kit comes with, the 15G is great at low end but really dies on top end. The 18G will spool up at about 3500 and pull hard to redline, unlike the 15G, which would spool up at around 2000 and just die at around 5500.... I also ran open downpipe. Hope this helps.

-Braxton