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NOW io2V3.1....Introducing the latest technology in Electronic rear o2 simulators,for catless, catless dp,or sport cats that don't deliver. The io2 V3.1 CatSim, the best simulator you will find, PERIOD!. The io2 has been developed as a test tool for rear o2 sensors and catalyst efficiency faults. Now the io2v3.0 CatSim offers the ability to pass monitor/readiness testing done by the PCM or ECM for the rear o2 and catalyst. FINALLY you dont need to tune out or autoclear the rear o2's..to add a header or downpipe/dp .please note, this product is for OFF ROAD/TRACK USE use only. The io2v3.1 CatSim is a very powerful tool that will work on any product, Chevrolet, Ford, Toyota, Honda even Chrysler, Dodge,and Jeep. and Now even BMW and the N55 engine! we are first at this!