2 into 1 Boarzilla stepped header design goes from 1 7/8 to 2 on the head pipe. All full systems come with heat shields and baffles. The muffler is upswept for better ground clearance. Will work with forward controls and mid controls. Note: Full system designed for a 117 CI or bigger. Each exhaust pipe is put on our dyno in our facilities. Every pipe is designed to increase low-end torque and horsepower. Comes with O2 sensor bung for fuel injected Harley-Davidson models. Fits: '00-'08 Softail Models This product is a display model. It has been mounted and ran on the Dyno.