PSI is always in search of the ultimate power system .
What s left to flow more air and potentially more power is the intake system. These are both good systems in their own ways, and PSI sells many of the Delta Force Systems, because they do produce a noticeable gain over stock reed systems. While Boyesen Rad Valves use 2 reed surfaces to supply great torque and reasonable power gain, the Delta Force uses 4 surfaces to provide a respectable power gain in mid and top end performances. We wanted it all, more bottom, more midrange and killer top end. After many designs that didn t work any better than the products already on the market, PSI continued our extensive search for power in the intake system.