This bolt on idler pulley and bracket aid significantly in preventing belt slip with smaller upper pulleys. We have seen this product work on our own cars at the track! If your vehicle is equipped with ATI’s 10% lower pulley and either a 2.85″ or 2.65″ upper pulley you will be able to retain the same 59.4″ supercharger belt.
If your vehicle is equipped with a 2.85″ or 2.65″ upper supercharger pulley you will be able to retain the same 57.2″ supercharger belt.
Steel pulley option only.