Improved power and torque Oxygen sensor location same as stock Includes adapters for use of wide band or stock oxygen sensors Use two high-flow cats to increase exhaust flow while providing just the right amount of back pressure for optimum torque Relocation of cats to 4-1/2" mufflers reduces heat on rider Produces a deep bass rumble exhaust note throughout the RPM range 4-1/2" billet end caps J2825 sound compliant Made in the U.S.A. Not for CVO models. Not for Trike applications.. EXH ED.50S BL/TRCR 17-20