Wondered if anyone had any ideas about this incredibly loud noise my T4 makes between 50-60 mph and above 80mph. Exhaust sounds like it is blowing slightly but when I reach 50mph the noise becomes so bad you can't hear stereo/ conversation. Really full throaty growling sound.

Car serviced every 6 months, exhaust checked yesterday (at kwik fit) and no problems found. Still has original factory fitted exhaust.

Mileage around 115,000 - was a company car before I bought it. Has full service history - no major work required.