Do you mean, will the Teo4h compressor hook up to a T25 exhaust? It'd help alot if you rephrased your question.
If you mean, will a t25 ehxaust hook up to your car in place of a te04h exhaust, the awnser is probably not. They make different kinds of exhaust for alot of turbos, all the t3 exhaust patterns aren't even the same. You just have to look at it and ask someone to measure for you before you can determine that. But beyond that, I bet your question is the first one, becuase going from a t25 to a te04h exhaust would be a huge jump... I don't really know the awsner to your first question, and the problem is that there are different kinds of t25's and some of them will connect really easy and some of them won't. If you has bought a new t3 it wouldn't be so much of a problem, they generally make all the new ones very compatable, but if you have an 'Oem' one, they do all kinds of wierd crap to them.