This manifold has provisions for mounting the stock MAP sensor directly to the manifold, and is primarily designed for Harley Davidson® Twin Cam 88® engines. However it may also be used on engines for 1984-' 99 big twins which require a MAP sensor, such as S&S engines equipped with the S&S Intelligent Spark Technology (IST) ignition. Fits Super G carbs on engines with 5.013" cylinder length. Requires MAP Sensor Machining.