Vance & Hines Blackbird Slip On Mufflers for 2017 2024 Harley Touring 4 Of The Best Sounding Slip On Exhausts For Your Harley Davidson Vance & Hines 16463 Hi Output Slip on Exhausts for Harley Touring (2017 Vance & Hines 4" Round Twin Slash Slip On Mufflers For Harley Touring. BRAND NEW PART # 16443 FITS: 2017 2020 Touring Models (Except Trikes) To celebrate the 40th year since our founding in 1979, Vance & Hines introduces a limited edition line of exhaust systems highlighted by special gold badging. Available only this year, this golden nameplate features our 40th anniversary logo laser engraved and is sure to be a collectors item for years to come. Featured as part of our 40th anniversary line, Hi Output Slip ons make a statement for Milwaukee Eight baggers, both in its bold stepped appearance and its unparalleled deep roar. 40th Anniversary Gold Badging