If you look at the pic - namely in the lower RH Corner of the crossover pipe - you will see that there was a small plate welded to this pipe to cover the hole where there "used to be" an external wastegate mounted - which is not mounted there anylonger.
My extarnal wastegate was moved to directly under the turbocharger - which bleeds air from all 6 cylinders - rather than only 3 where it was mounted on the crossover pipe.
Yes - this crossover pipe was used with the stock headers - which had an internal wastegate design.
Ed