1x Lextek Stainless Steel RP2 Silencer 300mm 51mm. 1x Lextek Stainless Steel Header. 1x Lextek Lambda Sensor Blanking Bolt (Brass) M18 x 1.5mm. 1x Lextek Exhaust Assembly Paste. About Lextek. Motorcycle exhaust pipes are fitted with silencers at the end to reduce the noise from the engine.