The Supertech sodium-filled Inconel exhaust valve for BMW N54B30A is a single replacement offered as a drop-ship item; the listing notes it should be used with locks. Supplied individually for N54B30A engines, this valve provides a direct-service option for exhaust valve replacement where sodium-filled Inconel construction is specified and appropriate valve locks are available.
Supertech BMW N54B30A Sodium Filled Inconel Exhaust Valve - Single (Drop Ship Only) (Use w/Locks)