Check the tyres for odd wear. My original mk5 golf blew the inside of a tyre out at 40mph, the mechanic I pulled into could actually put 3 fingers through the inside of the tyre wall. Spare on and too the tyre shop we went. New tyres all round, £450. Laser tracked and it was 6mm out and looking at the tyres that were removed it was really bad. Couldn't feel anything odd while driving though, no odd vibrations but the mk5 gti is a little rough anyway. Lost the car 2 weeks later in the snow at low speeds, never putting Kumho's on my car again.