Yoshimura KTM/HUSQ 250/350 19-22 RS-4 Stainless Slip-On Exhaust, W/ Aluminum MufflerYoshimura KTM HUSQ 250 350 19 22 RS 4 Stainless Slip On Exhaust, W Aluminum Muffler Brand new from KTM and Husqvarna for 2019 are re vamped 250 SX F FC250 and SX F 350 FC350. Both the 250 and 350 make good HP and torque in stock form, but nevertheless we went to work to improve power in every RPM range on these twin race machines and the gains we were able to attain with our RS 4 are quite impressive. We wound up with the 250 peak HP at 6. 6% and a