Genuine OEM Hyundai Exhaust Valve Spring, part number 222212M850. This critical engine component is responsible for closing the exhaust valves after they have been opened by the camshaft, maintaining proper valve timing and engine operation. It is located within the cylinder head assembly, compressing and decompressing with each valve cycle. Choosing a genuine OEM spring ensures it meets factory specifications for spring rate and material, preventing premature valve float or damage and ensuring long-term engine reliability.