S&S CYCLE 1800-2523 550-0677B El Dorado Dual Exhaust System El Dorado Dual Exhaust System - Chrome - Black ThrusterFeatures 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. Notes