I GOT A CLUBMAN OCT. 0F 2009. I LOVE MY CAR BUT HAVE A SMALL PROBLEM, IN FIFTH GEAR AROUND 4000RPM THE CAR GETS A WEIRD SMELL INSIDE. IT SORT OF SMELLS LIKE EXHAUST FUMES. PEOPLE DON'T WANT TO RIDE IN THE CAR DUE TO THE SMELL. I TOOK IT TO MINI AND THEY SAID THAT THE CAR HAD A PLASTIC COVERING THE MUFFLER AND THAT IT WAS REMOVED. EVEN AFTER THAT I GET THE SMELL AND THEY CAN'T FIND ANYTHING WRONG WITH IT. ANY IDEAS?