In most motorcycles all or most of the exhaust system gasket is visible and may be chrome plated as a display feature. Aftermarket exhausts may be made from steel, aluminium, titanium, carbon fiber or kevlar.
Motorcycle exhaust system gasket come in many varieties depending on the type of engine and its intended use. A twin cylinder may flow its exhaust into separate exhaust system gasket sections, such as seen in the Kawasaki EX250. Or, they may flow into a single exhaust section known as a two-into-one. Larger engines that come with 4 cylinders, such as Japanese supersport or superbikes often come with a twin exhaust system. A “full system” may be bought as an aftermarket accessory, also called a 4-2-1 or 4-1, depending on its layout. In the past, these bike would come standard with a single exhaust, as seen on the Kawasaki ZX-6R 2000 and 2001 models. However, EU noise and pollution regulations have generally stopped this practice, forcing companies to use other methods to increase performance of the motorcycle. This has often led to a decrease in fuel economy, because of increased weight of the exhaust system and manufacturers forcing more fuel into the engine to gain extra power.
The news come from:http://www.shield-sealing.com/
Seal Packing, Exhaust System Gasket, PTFE Sheet, Cut Gasket, Spiral Wound Gasket
