First, welcome to the boards as I see you are a new user with good inquiry about your supra.
Please do a little searching in the future about a specific question like this. Typically you will see alot of results that come back that answer your question(s).
As for the ebay manifolds for the turbos cars, they are great for the price.
They have 3 distinct flaws:
1.)They need to be finished ported.
2.)The wastegate flange needs to be turned 90 deg for the wastegate dump tube to mount propperly
3.)The early model manifold has the #1 runner hitting the oil filter therostat housing. You will need to grind the fins off to make it clear.
Good luck and happy boosting.