Turbo and ECU questions
 

Will a t3 bolt to the stock exhaust manifold for a 7mgte? I want to got NA-t with a t3 turbo but i cant seem to find a t3 manifold. Also, can a Megasquirt be used on the Mk3s?

No, a T3 will not bolt to the stock manifold. If you can't find a T3 manifold (I don't think I've ever seen one) you will need an adapter plate... It will probably be easier to get a T4 manifold and a T3 to T4 adapter, I don't know anyone who makes an adapter to mate a T3 to the stock manifold either.

Yes, a few people are running megasquirt on their MKIII. I'd hit SupraMania to research that one further.

Ok, thanks for the help man.