The End Caps ID is 1.5". This slides in and bolts in and takes the ID to 1.2". This takes the sound from 92.5 db to 91.1 at 4800 rpms. You may get a refund on shipping costs when this is bought with the End Cap or other items. depending on how it all fits in the box

1.2" ID Quiet Insert for 2020 -21 end cap

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    Best Dual Sport Bikes designs performance aftermarket parts for KTM and Husqvarna brand bikes. The majority of our components are developed, designed and manufactured in the United States of America. Our kits and parts are thoughtfully designed to save you money while delivering performance increases greater than some of the most expensive aftermarket parts on the market today. 

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