MSD Ignitions Multiple Spark Coils (MSC) will fit in place of the stock Gen-III GM coils and connect directly to the factory connectors. Once installed, youll have the power and performance of higher energy sparks, crowned with MSDs multiple spark discharge. Increased spark energy and voltage, along with multiple spark capabilities, help improve the combustion process of the fuel mixture to create an efficient burn. This results in improved throttle response, smooth idle and quick starts, plus increased high rpm performance!There are two types of housings for the MSD Coils. Check your application for the visual match.