don't throw it in the bin, sell it on ebay lol.
I had one come with my car (redundant due to RB25), and a mate had one on his RB20DET NICS, BUT it was already installed on the car from Japan, and was one of those ones set for the usual catback, removal of speed cut etc etc.
Main problem with the ebay ones is like what's been said, you often just don't know what specs or fuel they were tuned for