I live in Apple valley. When you say the pulse frequency will go up, I don't understand this completely. Are you saying the engine will be slightly less smooth? No, it will be more smooth. It's all very subtle, but when you are in a low traction situation the additional throttle response is very welcome. It's not about more power, it's about better power. As the exhaust pressure wave arrives at the end of the exhaust pipe, part of the wave is reflected back towards the cylinder as a negative pressure (or vacuum) wave. This negative wave, if timed properly to arrive at the cylinder during the overlap period can help scavenge the residual exhaust gases in the cylinder and also can initiate the flow of intake charge into the cylinder. Since the pressure waves travel at near the speed of sound, the timing of the negative wave can be controlled by the primary pipe length for a particular rpm.