Have noticed a worrying noise from the g/box on the car, a sort of rumbling noise when the clutch is dis-engaged, fine when engaged, what are the options, new box, rebuild, re-con, are these boxes unique to the sport evo or are they used on other cars in the bmw range, does anyone know the type or serial number of the boxes, so i know what to look out for if I need to source another box, the car was up for sale but I will not sell until this problem is fixed.

Thanx, steve.