Originally Posted by wantsti
What advantages does this have over an open mouth dp? Does adding that divider plate and another tube increase exhaust efficiency over standered tappered bell mouth?
Openmouth allows wastegate gases to mix too early and can cause back pressure against the turbine. A properly measured and installed divider plate gets rid of the threat of the minor lag that you'd see from a non divorced setup. Not a huge deal unless your moving a larger amount of air over stock setups and then you'd be better off with an external wastegate.