I got the o2 sensors for $77each, Gtr sensors are alot harder to get at than the gtst so it was easier to get the correct tool for the job
quote name='ahh 33 s2' timestamp='1295654225' post='5636783']
if u bought o2 that are RB25 compatible, couldnt u just get the ford EF o2 sensor from repco, as it mentions in the general maintainence section that that is compatable with the RB25, i did that and im sure it was under $100 for it, plus some connectors, and no special tool required,
a bit late now, but might help someone else that is looking thru this thread