Here is some literature for those that are interested, those that cannot be bothered, keep scrolling. Please excuse the Japan-a-glish, it was directly translated from Mugen Japan. >>
What is required for the development of the exhaust manifold is having equal length of pipes and perfect exhaust gas flow. On the dynamometer bench test, the pulsation, resonance and inertial effect of the exhaust gasses emitted from each cylinder in addition to the connecter’s position of the primary, secondary, and collector as well as the pipe’s diameter were studied to find out its optimum layout by delicately adjusting each length of the exhaust pipe and repeatedly making and trying the different configurations.
Furthermore we would like to recommend High-Performance Engine Oil VT-α, which fulfills the hidden potentials gained through MUGEN manufacturing technology. This engine oil is 100% chemically compounded oil of SAE 5W-40 developed through repeated bench tests to be suitable for the Honda VTEC engine. High specification engine oil possessing proper viscosity; and with newly developed additives (MODIC: organic molybdenum), it can hold an oil film under severe conditions. Though performance of the engine oil is in no way inferior to that of the racing engine oil, it also has oxidation resistance and low temperature stability ideal for street use. MODIC, organic molybdenum can quickly be penetrated into the metal friction surface where it makes a smooth metal surface by forming strong lubricating surface which in turn reduces the friction resistance and minimizes the loss of engine power as a result. Proven by bench-testing.
We believe that the oil line also plays a very important role. The MUGEN oil filter is exclusively developed for naturally aspirated engines and has “Y” shape cross section rather than a round cross section of the ordinarily fiber filter material. By adopting the “Y” shape, we were able to succeed in reducing the sludge reentering into the system with the sludge efficiently stuck on to the filtering fibers. At the same time, pressure loss is reduced by 10% and significantly increases the high temperature resistance capability.