i just got my 2010 legacy gt a few days ago and all was well until today when i started noticing an odd sound when accelerating. The noise sounds like a distant lawn mower and it happens around 2500rpm and gets noticable around 3500rpm. it wasn't like this a couple of days ago at which the car had only 500km, but now its at 1100km on the odometer.
Any idea what this could be? i am planning on going to the service center, but thought i post to get an idea before then.