Found a nut where no nut should be - in the turbo inlet. It's M6, 12mm across flats, 9mm long. 5mm of the length has flats, 4mm has been turned down to a cylinder 11.5mm in diameter. A small lump has been taken out of the cylindrical portion. Anyone recognise it? -- Phil Payne UK Audi [ur-]quattro Owners Club