The original exhaust manifold on most Keeway, Explorer scooters restricts the power a lot, which significantly hampers gas flow. With the NARAKU manifold, the short design forces the gas flow along the correct path, and by doing so, improves the resonance over the original item. The engine performance increases significantly, and is very noticeable on hills. The open manifold simply replaces the original header and is suitable for the original exhaust. The chrome finish of the manifold makes it more resistant to rust. Using the example of a Keeway scooter, maximum power can only be achieved in conjunction with a 57 or 58 main jet and 5.8g variator weights. Important Note: This tuning manifold only fits scooters with the exhaust type shown on Figure 3.