RPM Pro R "Big Core HeadPipe" Header Pipe

Often hated is the Pro R's "out of frame" head pipe. Make no mistake this is the most efficient head pipe design for this engine and we wont bore you with information in regard to gas wave propagation, cylinder overlap timing, gas particle flow, and proper exhaust pressure waves. Let's just say Polaris had help designing the head pipe the way it is, and there wasnt a lack of R&D.  Does this mean it's perfect? No. Polaris mass produces these and naturally the head pipe has "mass production" flaws. Furthermore the OEM head pipe is designed and built for a stock machine with a stock restrictive muffler. Polaris simply did what they could, with what they had. First less start with saying the RPM Big Core HeapPipe is a direct bolt on head pipe that retains the stock heat shield and can even bolt to the factory muffler ( or any aftermarket muffler that will bolt to a factory head pipe ). The RPM Big Core HeadPipe has a smoother than stock flowing inner core with less restrictive interio