... a proffessional manfacturer engined in engine parts, intake valve and exhaust valve is the main parts for Toyota,Niaasn, ... Honda, Suzuki, Daihatsu, Isuzu, Mazda, Buick, Peugeot, Daewoo, Kia, Renault, Citroen,Volkswagen,Mercedes-Benz, BMW, Audi, Volvo, Opel, Hyundai, Skoka ... valves are nitrided to increase the exhaustion strength, corrosion- and wear-resistant.Chrome-plated: valve stems with chromium to ...