S&S Cycle Power Tune® XTO Insert Kit165439392 Product Description 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 Easy to install
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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