I'll start off by saying this is NOT the sound of the engine, even though it does sound like a sports car engine, this is how my engine sounds https://youtu.be/l33msAzBg5k?t=178
Car: Citroen C4, Petrol 1.4L 2005, 69k Miles on the clock. Born and raised and still roams the UK roads.
The sound occurs when I'm doing over 20 mp/h. Bellow 20 mp/h Its either too quiet for me to hear or non existent altogether. Between 20-25 its hearable but still not that bad. Above 25 its quite noisy.
It's coming from the front wheels or their neighbouring parts. When doing 30-40 and turning left, and having the steering wheel above 30 degrees the sounds muffles quite a bit, to almost gone, but going straight or right, its there and it's very noisy. Having a read here, it seams it's one of these, but I have no idea which one. The car went trough Major servicing a month and a half ago. They changed one of the tires as it was very worn. The sound was there before the service, and was still there after.
The noise is always correlated with speed - bellow 20 Mph no noise. I can rev the engine at 9000 RPMs standing still in the parking - doesn't matter. It's only there when doing 20 Mph+
I know I'll get a much better answer combined with solution right away at any car servicing, but I'd rather know what I'm getting into, and how much it will cost me in advance.