ok, I was pulling 3 snowmobiles up eisenhower pass on sat and this richard crainium in an audi decided to try and pass on the inside shoulder, where there was no lane, so me being the dick that i am i sped up causing him to fall back. this happened 4 times but on the last time i did it my turbo started barking at me while i was accelerating,i let off the throttle and got back in it and it did not do it. the boost was roughly around 18-20 psi according to the edge. it has never done this before, and did not do it again after that. i know the turbo has shaft play but i was wondering if it means something else.