1x Lextek Stainless Steel Matt OP1 Oval Exhaust Silencer 350mm 51mm. 1x Lextek Stainless Steel Header (Single Sided). 1x Lextek Exhaust Assembly Paste. 4x Lextek Exhaust Gasket 36 x 45 x 4mm. Motorcycle exhaust pipes are fitted with silencers at the end to reduce the noise from the engine.