These HiRise Series Manifolds can be used for racing applications or for serious street performance. It has a number of unique features such as a rear water crossover passage, nitrous/injector bosses, and four corner water ports. This manifold features injector bosses machined for injectors. Step up to the high-rpm power of an open plenum Design for racing applications or for serious street performance Cast from steel molds for a tighter grain and reduction of porosity Pressure tested to ensure maximum performance