Stage 1 tune. Whistling sound

[Chris pen]

Hi guys. As i do not know much about turbo diesels i thought id ask. I had my 2008 1.9tdi stage one tuned. Since the tune i notice a whistling sound when i accelerate through the gears. I read online this could be the turbo spooling up more pressure due to the tune. Or could it be the accuator itself. Is this whistling normal after a stage 1 tune? Its running 160bhp and 325lb of torque off this tune. I could not hear this prior to the tune 3mths ago but have since. It could be a biproduct of the tune but thought id ask as know very little about turbo cars in general. Thanks. Chris.