2-into-1 equal-length headers. 1-3/4″ headpipes. Includes (2) Headpipe heat shields. Utilizes an advanced inner collector for maximum performance. Mild steel Construction with Mig Welding. Made in the U.S.A.. Fits models with mid controls only – no forward control models. Includes 18 mm O2 sensor ports and 12 mm adapters.