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Didnt do my own install though, Might have to looking into that before I bolt the 10psi pulley on.
Did the shop give you back your stock idler pulley? If not you can order one form summit, but i'm not totally convinced that you need it. Some people were getting belt slip with the 10psi pulley so they added the 100mm idler to the kit, then they said to put the 90mm idler on the tensioner.