Starting Line Products Single Pipe Kit SLP tested and passed SAE J-2567 stationary sound test below 88 decibels. It delivers an additional 8.5 horsepower peak and sheds a staggering 20.8 pounds of weight on 2014 models. This single pipe kit includes y-pipe, pipe and silencer all of which are ceramic coated. It requires the use of a Power Commander V fuel control box and some clutching changes are required