Bassani Road Rage B1 Exhaust For Harley Touring The Bassani Road Rage B1 Exhaust is a full exhaust system for motorcycle enthusiasts who are serious about horsepower. This exhaust system was developed to produce flat torque curves and a noticeable increase in horsepower via precision-fabricated high-grade 16-gauge steel stepped head pipes. The true reverse-cone megaphone features a fluted billet aluminum end cap and includes a removable spiral-core louvered baffle. Features: Features a 2-into-1 equal length stepped head pipes 1-3/4 to 1-7/8 to 2 Four oxygen sensor ports, 12mm O2 ports for factory O2, and also 18mm for wide band O2 The B1 Muffler uses a unique extended inner collector maximizing performance B1 is designed for higher horsepower engines Recommend for 110 CID engines and above 2-1/2 x 19-1/2 baffle inside Megaphone muffler housing with 4 black coated end cap with contrasting flutes Head pipes are industrial chrome and come with full coverage chrome heat shields Designed specifically to address the needs of motors built for high torque, high horsepower applications