... We are a professional manfacturer for engine parts. Intake valve and exhaust valve for AUDI Toyota, Nissan, Mitsubishi,Honda, Suzuki, Daihatsu, ... Skoka, Lada,Fiat,Alfa etc, are the main products we are dealing in.2. The main specification of intake & exhaust valve for Audi ... for your reference:3.The materials for ...