about the whistling
bought my 03 orange msp 10 months used. It never had that typical whistling sound i head on VWs like 1.8t golf or even passats in traffic when accelerating. I had a VERY VERY VERY faint whistle mixed with zzzzzz. Weird way to describe i know. It was very low and SMOOTH sound that never changed, unlike some who hear it at high rpms when flooring the car. After some problems with other things (stumbling upon acceleration and cel indicating lean status of car) they ended up changing my turbo with a new one saying it was a faulty wastegate actuator. Now i have a new turbo and the sucker sounds sweet. It a nice whitling sound when i get on the gas in any gear in traffic as long rpms climp from about 2500 and above. I'm pretty sure this is what a turbo should sound like. It seems to be louder and comes up earlier in the cold climate (turbo spooling up earler?), but i think this is normal????, then again, our cars are not predictable, they are each posessed by a different ghost.............hope this helps.
