Motorcycle Exhaust Downpipes Headers Fits: Kawasaki ZX-6R ZX636 Ninja 636 2024, 2025 models - 304 grade stainless steel. - Designed to fit any silencer that will fit the OEM headers and our own Black Widow Silencers. - Straight through, no restriction, compatible with your standard Kawasaki silencer or any made to fit your standard exhaust system. - As these come with the option of still using your exhausts Lambda sensor (if fitted) you can simply fit and ride, if your looking to maximise your bikes full BHP we would recommend a professional Dyno set-up. - We do not include the full gasket set, only the silencer gasket. - All Lambda sensor options are covered. - Blanking plug for those opting for a sensor delete when set up by a professional. - 2 Year Black Widow .