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Mach 2 Atmosphere Upgrade Kit to convert 223858 = T9103 or 223872 = T9133 from recirculating to atmosphere venting blowoff valve.
Consisting of trumpet, spring and plug.
Replace the outlet / recirculating hose tube connector on the blowoff valve for the trumpet. Exchange the standard spring in the valve for the new spring designed for atmospheric venting.
Seal the recirculating hose of your car with the plug.
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