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The HKS Super Sequential Blow-Off Valve (SSQV) is a dual stage pull type relief valve. Unlike other blow off valves that are push type, the SSQV will not leak under high boost conditions nor under vacuum at idle. Being of a pull type valve structure, the SSQV can not physically leak under any level of boost because boost pressure also keeps the valve closed against its seat from [ http://www.titanmotorsports.com/hksunbov.html ] almost all others will leak under boost, requiring spring rate changes, etc. HKS requires no adjustments.
PETZ (member #003)
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