Enlarged interconnected headers make for improved horsepower and low-end torque 1.75ö to 1.875ö high-flow 16-gauge stepped primary headers Features full 2ö left side crossover and 4-1/2ö muffler bodies with 2ö inlets 2.50ö, 220?, 16-gauge heat shields Removable baffles are wrapped in stainless steel wool and high-temp fiberglass for a rich mellow tone 18mm and 12mm O2 bungs welded into the primaries Heavy-duty, AccuSeal« reaction-block header-to-muffler clamps included Optional Ripper baffles boost low-end performance and enhance sound available separately Additional performance baffles are available separately Made in the U.S.A.. EXH W/4.5"MUF 17-UP FL B