The HKS SUPER SQV (Sequential Blow-Off Valve) employs a unique two-stage sequential valve structure using primary and secondary valves. It features a differential pressure control system that delicately manages pressure across a wide operating range from low to high boost. Unlike typical blow-off valves, its "relief-less operation system" suppresses relief at high boost, maximizing charge response during repeated boost and release cycles with throttle ON/OFF.

■Features

• Blow-off valves are placed on both banks of the VR30DDTT engine, quickly releasing unnecessary boost pressure from each turbocharger, reducing their load (when the throttle is off).
• Hoses between the turbocharger and intercooler are replaced with dedicated 4-ply silicone hoses for the SQV4, strengthening the hose section.
• All parts except the SQV4 main body are in black to highlight the SQV4.
• The return hose uses a dedicated molded silicone hose, fitting snugly in the engine bay.

■Blow-off Sound Volume Image (atmospheric release)

*Atmospheric release is not suitable for vehicle inspections, so use it only on closed courses.

	Revving (Cabin)	Revving (Outside)	Driving (Cabin)	Driving (Outside)
HKS SUPER SQV IV
NORMAL

■Kit Includes

• SSQV main body, SQV hose, mounting bracket, other parts

■Notes

• Installation requires modification of genuine parts:
• Harness bracket, cowl top cover, hood ridge cover,

Vehicle	Model	Engine	Model Year	Body Color	Suction Return Kit	Code No.	Manual	Remarks
FAIRLADY Z (Z)	RZ34	VR30DDTT	22/04 -	SSQV4 (Silver)	×	71008-KN030