Supertech valve guard. Newly redesigned and now fully CNC machined for a higher quality and finer finish. Fits: BMW N54 Turbo 3.0L 24v Reference: Fits exhaust valves. Single GrooveSupertech valve locks.Newly redesigned and now fully machined on CNC for higher quality and more accurate finish.Fits: BMW N54 Turbo 3.0L 24vReferences: Fits exhaust valves. Single groove