Supertech VW 1.8L/2.0L 8V Black Nitrided Exhaust Valve - +1mm Oversize - Set of 4

Supertech is known for making well-built internal engine components. This set of four exhaust valves is made for VW 1.8L and 2.0L 8-valve engines. They are 1 millimeter larger than stock, which can help improve airflow into the cylinder when you're rebuilding or modifying your engine's top end.

These valves have a black nitrided surface treatment. This process hardens the surface and makes it more resistant to wear and corrosion, which is important for exhaust valves that deal with high temperatures and combustion gases. The +1mm oversize means they are slightly larger in diameter than the original valves, which can allow for a greater volume of air and fuel mixture to enter the combustion chamber. This is a common modification when rebuilding an engine to potentially increase performance.