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.