Supertrapp 2-into-1 Megaphone Exhaust

4" Disc based tunable system to adjust to your engine build. Full stainless steel construction with brushed satin finish. 15-20% power gains in the low/mid range. Has 18mm O2 ports in pipe, supplied with 12mm adapters and plugs for carb models. This system has a completely rebuildable core. Mounting bracket included. Fits:   2004-22 Sportster (Except RH1250/RH975) CALIFORNIA DISCLAIMER: Not for use on public roads. For competition and closed courses only. Subject to emission control requirements in California.