A catalytic converter is one of the more interesting components of any automobile’s exhaust system. The 1998 BMW 328I’s catalytic converter, like all catalytic converters, is installed to scrub the exhaust gases of harmful pollutants. Catalytic converters are primarily designed to reduce or eliminate nitrous oxide, sulfur dioxide, carbon dioxide and various hydrocarbons. It uses the heat and pressure of the exhaust itself to form a chemical reaction within the system. The catalysts for this reaction are metals of the platinum family. Greater concentration and a more efficient layout of these metals, such as you will find in a DEC 328I catalytic converter, will increase the efficiency of this reaction allowing the exhaust gases to flow through more smoothly and increasing your horsepower. The metals you will find in a BMW 328I catalytic converter are platinum, palladium, and rhodium. These metals are spaced around the various chambers of the catalytic converter and are found as both sheets and beads. Because the more advanced DEC 328I catalytic converter contains more of these metals, it is somewhat more expensive than a stock cat, but the power gains and better design make the DEC catalytic converter a superior choice. Motor hobbyists should certainly get terrific sales assistance when considering good quality auto parts from us. Thus, we make available a 24-hour, 7 day a week technical assistance call center to aid you with your queries. If you can find a better price, call us - we always beat any price advertised elsewhere.