A few long bolts...and if you are just replacing the coupler you only have to pull the snout off but be sure to drain the supercharger oil first...there is a small black piece in the front of the snout that can be removed with a alan wrench. Siphon the old S/C oil out (be sure to have 2 bottles of new S/C oil which you can get from a dealership) and remove the oil coupler and put the new one on. Best couplers IMO are the green ones from ZZ Performance.