play R 32 (i think thats his user name on the forums) is running in his R32 GTST with a RB26 conversion with a rb20 gearbox at over 300rwhp
since its an auto your going to need a custom tailshaft, centre console, clutch master/slave cylinders n shit done, if your not a bastard on your gearbox then a rb20 box would hold up fine
btw what is the price difference between a rb20 and rb25 box coz 1500 sounds cheap as last year when i enquired i was gettin quotes of 2-3k
1 more thing, C-red does a drive in drive out deal on this for $3800 using a 25 box, takes approx 4 days i THINK (quotes from last year so might be a outta date)