Dont they come with a Getrag box from the factory? going off my GTO's getrag box i wouldn't hold them with any high esteem(not that i know anything of the Supra's box)
Stock wise there a pretty safe bet, modified, well your at the owners mercy!
Ask for the dyno sheet for a start and the work carried out, its pretty easy to get 500bhp as a dyno queen, its a different kettle of fish getting a reliable/usable 500bhp.
Supras are pretty strong if looked after properly.
You wont hear me disagreeing with that
I cant speak for the Supra the OP's looking at but when you see single turbo conversion kits on ebay very cheap, you have to be cautious, its so easy these days to get big power very cheaply.
cheap turbo, ebay boost pipes, silicone vac lines, I'd say walk away![]()
I don't see anything wrong with that tbh, pipes, IC etc you can't go too far wrong. Holset turbo will make power cheaply and reliably. 2JZ engine will run 500 unopened no problem as will the box. The only tricky bit is management and tuning, anyone who isn't a fool gets an experienced professional on that job.