Hi all,i am fitting Vance & Hines Twin Slash Rounds on my 2017 tri glide,do i need a tuner,thanks

 

A tuner will help, and with the 2017 and newer bikes, if you want to keep your warranty, the Screamin Eagle Street Tuner is it. You can add the Screamin Eagle Auto Tuner to the bike that uses wideband O2 sensors for a better tune.