Every single Fuel Moto E-Series exhaust system model is put through and extensive R&D process that includes power, sound, air/fuel curves, mapping, fitment and finish. No detail is left undone. Then, and only then, are all tooling and fixtures developed for manufacturing and production of the finished product that has now arrived to you.
HOW THE E-SERIES DIFFUSER DISCS WORK WITH YOUR ENGINE
Your engine is essentially a big pump, our goal is to increase efficiency by creating more pumping affect. As the exhaust valves open, a wave of energy is generated which travels down the pipe. When it reaches the end of the pipe, negative pulse is reflected in the reverse direction. If the length of pipe is adjusted so that the suction wave arrives back at the exhaust valve just before it closes, a vacuum is created, allowing the cylinder to be charged with a purer mixture. The inertia in one moving exhaust packet assists the flow of the next charge. A purer mixture can now enter each cylinder, resulting in stronger explosions and more power. The wave of negative pressure produced is a combination of high energy and short duration. Essentially, this effect produces an increase in power over a relatively small RPM range, however a wider powerband can be created with the use of a diffuser.