Sawicki Speed Shop Big Inch 2-Into-1 Mid Length Exhaust For Harley Dyna You don't have to compete in the bagger race league to realize the performance benefits of a US made 2-into-1 exhaust system. Your daily rider will come to life with a good pipe and a tune. The Shorty 2-into-1 exhaust from Sawicki Speed Shop looks great and provides a deep, purposeful tone. Big Inch Exhaust Systems are only recommended for motors 103 and larger. Features: Classic stepped performance headers 1-3/4 primary to 2 for maximum performance Mandrel bent aircraft quality stainless steel tubing Hand formed merge collector allows precise flow performance Accepts forward and mid controls All TIG welds performed by hand in Charlotte, NC 18mm O2 sensor bungs for aftermarket tuners, accepts 12mm sensors with reducers 10hp and 8 lb-ft of torque over stock 13lbs total system weight Note: Sawicki recommends flat mesh race style exhaust gaskets.