Khrome Werks 2-Into-1-Into-2 Dominator-Sr Exhaust System813003868 Product Description Engineered for performance, style, and sound Improves torque and horsepower from stock to the largest displacement build Removes OEM head pipe catalytic converter to reduce heat and improve rider comfort 2 step head pipe (1 3 4" 1 7 8") 18 mm and 12 mm O2 bungs welded into header primaries for street legal tuning or race only applications Heat shields with 220 coverage 4 1 2" HP Plus compliant mufflers deliver Khrome