Your search for "Supersport 939 2017 2018 2019 2020" revealed the following:
Optional Header (SS)
$829.20Built from perfectly welded, high-grade stainless-steel tubes, these headers convert the Slip-On Line muffler to upgrade it to a full...
Built from perfectly welded, high-grade stainless-steel tubes, these headers convert the Slip-On Line muffler to upgrade it to a full...