I'm new here !
I have a 20 days old ASTRA OPC (Z20LEH) that reached 3500 Kms already.
When the car was below 1000 Kms there was no sound at all when changed speeds, then I begun to notice a sound like "whuh! everytime changed speed over 2000rpm's in the right side of the cabin but now the sound changed a little bit and sounds like "tsswhuh !" but little bit louder.
Is this normal ths change of sound ?????? I'll apreciate your information.
PS: My car is sold as Chevrolet in my country with different front mask, take a look here :