Power Tune® XTO Insert Kit

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" pluggedTunable inserts allow for easy sound and power adjustmentPower and torque tuningTone and sound adjustmentEasy to install