Non-homologated racing part; without catalyst. Raw stainless steel header pipe kit; without catalyst. Precision one-piece TIG-welded construction for a positive no-leak installation for optimum O2 functioning in all RPM''s. Comes with a O2 sensor connection on both front & rear head pipe. On the rear section/balance pipe; designed to perfectly balance the left & right muffler; a 3rd O2 sensor connection is available to install the 3rd (downstream) O2 sensor as in use with EU Euro5+ H-D models. Compatible with stock/aftermarket mufflers and stock heat shields; under which this head pipe set is; like stock; not visible. Note: These header pipes do not have a catalyst so it belongs to the ''racing category'' and is not street legal.