turbo 6 bangers post here

assuming there is adjustment on the stock wastegate you should be able to play with the preload to get the wastegate to open a little sooner. for example the rod coming out of the actuator should have threads on it. pop the clip off of the lever and turn the end in so there isnt as much pressure holding the gate shut. on a side note, a stock slant will hold up to 15psi with the right tune.