Rinehart Slimline Duals 4 exhaust system. Since the slimlines are the same size as the original manifolds, you have a large selection of silencers. More power and torque than original tubes.Version / color / finish of the end cap. Suitable for the following Harley models. 17 -'20 all touring. 4 "slimline duals Exhaust system Rinehart Slimline Duals 4 "exhaust system.