I looked closer at the kit on the car tuning website and I can see that the waste gate bolts to the downpipe, and then has a pipe that goes to the crossover, it does look like the oem rear exhaust manifold is necessary, but it also looks like a flange could be built to interface between the downpipe and crossover to use the rear power log. maybe cut the flange off where the downpipe attaches to the oem rear manifold and weld a v band clamp with a short amount of piping, and a v band on the other side? worth the effort or not?
