read this info from a very well trusted and very great company...
AfterDark Tuning.... http://www.afterdark-tuning.com/engines.html
i sent them an e-mail seeing if they could swap in an SR20DET or even an RB20DET.. it would be about... $2,000 for a complete install.
Package Includes: Complete block, head, manifolds, turbo, stock mount intercooler and piping, complete harness, all sensors, ecu, transmission, and motor mounts. Radiator, AC, PS, and other miscellaneous parts included when available.
S13 SR20DET Redtop - $2200
S13 SR20DET Blacktop - $2600
S14 SR20DET Blacktop - $3200
S15 SR20DET Blacktop - $4900
FWD SR20DET Bluebird - $2100
FWD SR20DET GTiR - $2550
RB20DET - $2150
RB25DET - $3500
RB26DETT Stock Setup - $6000
RB26DETT w/ RB25DET Tranny, Oil Pan/Fittings, Crossmember of your choice - $6500