Super Tiger is not out of business. The factory was sold and moved to China so there hasn't been any new motors for a while. They have started releasing motors again though. I've one myself, from the Chinese factory. The motors are exactly the same as the tooling and everything was sold and is being used now.

It is true that the 60 size TF header will cause the 90 to overheat, and that's to be expected. You can check into Slimline for a better solution.

Mark