you might not be able to use the standard pipes.. because you need a custom manifold to sit the turbos a bit forward more to enable them (and the rb26) to fit.. hope i didnt confuse anyone - lol
RB25 tranny does mate with the RB26 - however.. with the fitting of my rb25 gbox we used a SR20 auto gearbox crossmember with a custom mount for the xmember to rest on..
i have some pics on my pc on how mine is set out - will post them later
cheers
BRAD