The 1996 BMW 328I was one of the first cars to adopt OBD2 computing. That means that many components of the 1996 version 328I are going to be incompatible with earlier models. OBD2 has made it considerably easier to diagnose pesky emissions or other engine management problems. If you have recently failed an emissions inspection, your OBD2 system should be able to quickly and accurately pinpoint the problem. If it indicates a problem in the BMW 328I’s catalytic converter, it is a good opportunity to upgrade your cat to a performance system. While BMW always maintains a focus on performance, in order to stay competitive in the marketplace, they have to install some inexpensive components. If you have to replace your catalytic converter anyway, you might as well install a performance DEC 328I catalytic converter. A DEC BMW catalytic converter is somewhat more advanced than the stock system. It uses greater quantities of precious metals, more open chambers and baffles, and wider inlet and outlet ports to even out the airflow, giving you more horsepower. The less restrictive nature of a DEC catalytic converter also means that your BMW 328I will have a different exhaust note. It will sound deeper, fuller, and more powerful, all traits that appeal to the automotive enthusiast. Gearhead hobbyists completely deserve tremendous technical support while looking at good quality car parts. For our valued customers, we've built a 24/7 technical support desk to answer all your questions. If you spot a lower price elsewhere, give us a call - we will meet or beat any legitimate auto part price.