5-axis CNC ported manifold. Maximum aerodynamic efficiency. Works with stock or ported heads. Textured finish encourages fuel dissipation and atomization. High-temp, durable black powder coated finish. Fits all 55 mm throttle bodies. Made in the USA. Fits 17 to 24 M8 except 23-24 FLHXSE, FLTRXSE, 24 FLHX, FLTRX, FLTRXSTSE. Replace stock oem which tends to leak and wrap.