This catalytic converter will fit either 1.9ltr or 2.1ltr. The catalytic converter comes with a threaded hole for the oxygen sensor for the 2.1. For the 1.9 where the oxygen sensor is positioned in the pipe up stream from the cat, we supply a plug for the hole. Please note, California has initiated a new rule regarding special catalytic converters. This cat is the regular 49 state Federal cat. Gaskets and mounting hardware are sold separately. If in need of California cat, please call us to discuss further.