* An aluminum diecast part ensures a super lightweight & compact body. * The air capacity of the air chamber increases by having air jackets all around the cylinder valve. * A large opening nozzle improves air discharge efficiency, and facilitate the tuning of the intoxicating & addictive blow-off sound. *R2D2's air sealing reliability is tremendously improved by integrating the valve & the shaft design. This design also make the part more compact & lightweight which also equates to a more affordable price. *The Sard R2D2 Blow Off Valve is another loud blow off valve that screams attention when activated! Makes the Psshhttt noise that every turbocharged vehicle must have!