The turbo is "only" a T34 with RST style .63 ex housing. The external wastegate is used because it allows the turbo to be located without thinkig about the wastegate actuator position etc. Also in the future I have a wider selection of turbos as I don't need the integral wastegate.

The location of turbo was selected because a I'm using a remote oil filter and the around the gearbox is a little bit tight now.