I am having a friend of mine who works at an exhaust shop make me a 3 in DP, but the question is, how does it connect to the wastegate housing on a T3? I measured the inner diameter of the hole on the housing and it is almost 2 1/4". Is there a speacial flange gasket that needs to be used or something? It just doesnt seem like it will make a good connection. Thanks guys...