Hi, ive got a random whistling sound coming from my s3(2008) its currently running a stage 2+ revo map!! the whistling sound occurs when i accelerate hard upto 70ish then will stay on until i slow down to about 25 mph.. to me it sounds like it is coming from somewhere near the engine cover!
here is a vid to listen to this random whistle..
audi s3 whistling engine noise?? - YouTube
cheers for any help