Description Reviews MINI Turbo Stud Kit. These are the (3) studs & (3) lock nuts that are on the turbo that hold the down pipe on. Fits both the N14 or N18 turbo and are brand new OEM. This Kit includes: (3) MINI Turbo Nut M8 #18-30-7-583-746 (3) MINI Turbo Stud M8x31 #18-30-7-598-251