This press release just in from Yoshimura:

Yoshimura is excited to introduce the Alpha T slip-on for the 2017 KTM 390 Duke/RC390 and Fender Eliminator Kit for the 390 Duke.
Both of these fun machines are a blast to ride, now Yoshimura helps the 390 pack a punch and look even better. Our new Works Finish Alpha T slip on adds the distinctive Yoshimura sound and provides the 390 single cylinder engine 11% peak H.P. and 17% peak torque. Can you say fun? Our famous Fender Eliminator Kit complete with LED light, cleans up the back of the 390 Duke nicely.
Proudly made in the U.S.A.