My tensioner bearing failed and started to squeak/chirp especially when the RPM is above idle which was extremely annoying. so you don't have to use an extension) 14mm ratchet wrench (for the tension screw) (to save time can be done with a 14mm wrench) 10mm and 8mm socket (10mm for the plastic cover and the detachable portion of the bracket Airbox hose clamp) (8mm for metal zip ties) (memory hammer drill) Pliers (for hose clamp) Tension bolt torque unknown but no breaker required, felt somewhere in the 30-40 ftlb range