Whistle >2k rpm on 1.9 GT
Developed a whistle which only begins at 2k rpm or above. This occurs whether driving or revving at standstill.
Stuck my head in engine bay whilst my neighbour revved to see if I could hear if it was the top hose. Seemed a bit louder by passenger wheel, which would suggest lower hose, I think.
One point I would like help with: upon revving, I could visibly see the top hose moving or slightly expanding, which to me suggests its under pressure and therefore not leaking. Does that sound feasible?
Could it also be a turbo problem, rather than split hose? would that be far more unlucky?
car is on 112k, 8 years old, original hoses.