Yoshimura RM-Z450 18-25 RS-12 Stainless Full Exhaust, W/ Aluminum MufflerYoshimura RM Z450 18 25 RS 12 Stainless Full Exhaust, W Aluminum Muffler After over three years in development and testing we are pleased to announce the RS 12 is here! With the help of incredibly talented factory sponsored athletes, technicians, devoted engineers and a will to raise the bar, our RS 12 has now arrived for the 2018 20 Suzuki RM Z450. We considered all the details when it came to the RS 12. One look and you can see it's like nothing