2-into-1 equal-length headers. Stepped 1-3/4″ to 1-7/8″ headpipes. Utilizes an advanced inner collector for maximum performance. Stainless Steel 304 Construction. Upswept Megaphone Muffler with removable end cap. Hand Tig Welded. 18 mm O2 Ports with 12 mm Adapters and plugs. Made in the U.S.A.. Fits Mid-Controls ’91- 2017 and forward controls ’07-2017.