This may sound like a bit of a piss take but I've noticed my T5 makes a strange whistling/warbling sound, quite similar to a pheasant, when you blip the throttle when cold.
It only does it when the revs drop back down to idle and only when it's completely cold.
I'm not sure if it's related but I've also noticed an inconsistent throttle when holding revs, it sort of surges but on a very small scale under load.
I'm thinking it's either boost hoses or vacuum pipes.
Any thoughts?
p.s. I'll try and get a video as the description doesn't really do it justice.
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