Hey guys, recently I've noticed a weird noise coming from my car. It happens when accelerating slowly and from 2'500 - 3000 rpm a weird sort of faint droning noise comes in for a sec and goes. It sounds like when you blow into an empty glass bottle you know that wooooooo noise, but I get it slightly and only at those revs, been noticing it more and more. It is due in for service (1 week over due and got 2 weeks till I got it booked) What do u think it could be? Hope I made some sense in my explanation. Other than that I dont get any weird vibrations or anything like that so I'm a bit mystified (me thinks might be something to do with the turbo because its starts spooling at those rpms) and I can't pin point where the noise is coming from but it could be either engine bay or exhaust not sure yet.