Engineered to handle todays higher displacement motors, Upstarts feature 1 3/4in. head pipes stepped up to 2 1/2in. Quadradical up-slash muffler bodies. Internally, stainless steel, perforated core baffles wrapped in dual density packing complete the system. Full coverage 2 1/4in. head pipe heat shields, 18mm O2 ports with 12mm inserts, and hand crafted, high quality fit and finish round out the package. Finished in show quality chrome or black ceramic coatings, Upstarts are available for Sportsters, Softails and Dynas. Custom, hand crafted Quadradical up-slash styling. Stainless steel, perforated core baffles. Stepped 2 1/2in. muffler bodies for increased performance and quality sound. O2 sensor eliminator plugs available. Not legal for use in California on pollution controlled. vehicles, check local laws before installation.