Yoshimura KTM 500 EXC-F 20-23 / Husqvarna FE 501S 20-23 RS-12 Stainless Full Exhaust, W/ Aluminum MufflerYoshimura KTM 500 EXC F 20 23 Husqvarna FE 501S 20 23 RS 12 Stainless Full Exhaust, W Aluminum Muffler One of the most popular Dual Sport bikes on the planet, the KTM 500 EXC F, now has the ultimate exhaust option with our all new RS 12 full system. Packed with features, the RS 12 Enduro Series offering comes with a USFS approved spark arrester and massive gains in power. The KTM 500 EXC F saw gains of 21. 8% peak HP and 15% peak torque on the dyno.