Astra - faint whistling noise

I have a Vauxhall Astra 11.7 2007 plate. Just around 2 months ago I got my turbo replaced with a brand new one and also timing belt replaced. However, recently I have heard a faint whistling noise when accelerating in 1st and 2nd gear ONLY. Any ideas what this could be?


check pipes for splits

It could just be that your turbo is operating as it should but you can't hear it when you are going quicker because of other noises etc.
Without being funny, no one will be able to diagnose a problem with the description. If you know and trust the garage that fit it, trust them. If you are really concerned, have a word with them. Either way, as long as the car is running as it should, I wouldn't worry

Can you tell us what tune it sounds like. This will be a lot of help.
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