This includes: 1 50mm BOV, 1 air fitting, 1 o-ring gasket. Universal weld on flanges are available in Mild Steel, 304 SS, or Aluminum.
Colors other than bare aluminum may add to order lead time.
Select the appropriate spring for what your car pulls on a vacuum gauge at idle. You need to have a boost/vacuum gauge connected to the intake manifold while the engine is idling to measure this.