S&S Off Road Division Muffler Insert Cap For Power Tune XTO Exhaust The S&S Muffler Insert Cap is a high-quality component crafted for riders seeking enhanced tuning capabilities. By blocking off one outlet, it allows for more precise adjustments to the exhaust system, enabling superior performance tuning. Ideal for motorcycle enthusiasts looking to fine-tune their ride's exhaust note and performance characteristics. Features: 1.75 Power and torque tuning Tone and sound adjustment Ease of installing 304 Stainless construction