S&S CYCLE Power Tune XTO Insert Kit 550-1032
Includes two each of the 1.375", 1.5", 1.625", 1.75" plugged front with 3.5mm holes, 1.75" plugged rear with 3.5mm holes, 1.875", 2", 2.25", and one 1.75" plugged Tunable inserts allow for easy sound and power adjustment Power and torque tuning Tone and sound adjustment Ease of installing