Since ive had my s3 its lost power and i compensated for this by adjusting the wastegate a while back, since then ive fitted a b5 tip, found a few boost leaks and done a full pcv delete with catch can, it ran great for a few days but it seems like its loosing power again, everytime i make it run well, a few days later its back to its usual self. 1st gear is fine, but when accelerating in 2nd or 3rd the turbo sounds like its working overtime and the car isnt going like it should, it sounds like the turbo is going to explode, theres a loud low pitched hiss and also a high pitched hiss and it doesnt go like it should. So ive been thinking, the mods ive done and leaks ive found will the turbo be overboosting and the ecu compensating for this by the n75 valve? is this completely wrong or could it be true? is it worth backing the actuator off and giving it a go or will it just result in less power simples?