I think the GT35R is on its limit, i will probably run at the lower boost setting most of the time, i also fitted an additional silencer whilst on the hub dyno and tested it at full boost, the engine lost 30 wheel hp. I may be forced to use this on track as the car is a bit noisey when on boost at high revs.
I will try to avoid using it as i am concerned with the strain it will put on the rest of the exhaust and more importantly the exhaust manifold hanging off the end of the tail pipe.