Manufacturer Part Number: 3261. Thread Size: 1-7/8". Material: Aluminum. The result of these efforts?. NRG SRK-200CF Quick Release Gen 2.0 Black Body Black Carbon Fiber Ring NEW. SuperTech SIVN-1050-2-8 Intake valve 35mm(std) x 5.46mm x 105mm/ SS EV8/undercut.