Designed for peak performance and style. Maximize horsepower and torque. 1.75” to 1.875” 16-gauge stepped primary headers that merge into a 2.5” collector. 2.50” high-flow baffles wrapped in stainless steel wool and high-temperature fiberglass. 2.50” tapered baffle exit cone to enhance low-end torque. 2.25”, 220° 16-gauge heat shields. 18 mm and 12 mm O2 bungs welded into the primaries. Shown with optional end cap. Made in the U.S.A..