My S3 has started to occasionally make quite a loud blaring noise under acceleration (particularly if I'm in a slightly high gear for the revs) which sounds almost as if the exhaust has a blow somewhere in its front sections. However this seems a bit unlikely given the age and mileage (2.5 yrs old, 25k miles). Is this normal?? My old TQ never made such a noise so I was just faintly worried that something was amiss. Doesn't seem to affect the performance, just sounds noticeably odd. Does anyone else have any experience of anything similar? The car is a completely standard 225.