OK, my intake piping from the turbo to the throttlebody holds 20PSI for 5min with no drop...
I am starting to think that there is something going on with either the N75 valve, or the actual wastegate...

 

The wastegate control lines are Tee'd off the N75. You could disconnect the wastegate feed from N75 and connect a regulated air supply (10psi is plenty). I've used an air blow gun to repeatedly gently apply some air pressure to the wastegates control line while a helper is underneath the car to see if both the actuators are moving freely.

N75 is not hard to replace. The factory hose clamps are re-usable if you have the right crimp tool and some patience.

 

Thats great, I never thought of testing it like that.... I already replaced the hoses on the N75 valve. I also got a CEL. The code was P1136 "Long term fuel trim add fuel B1 System too lean" I think I see a VAG-Com in my near future...
This **** go-cart is starting to tick me off!