HKS Super SQV4 Blow Off Valve 2017 2021 Honda Civic Si (71008 AH011 HKS SSQV4 Universal Blow Off Valve SUPER SEQUENTIAL Nitrous Power DJP Performance Performance Parts HKS Super SQV Blow Off Valve HKS Super Sequential Blow off Valve SQV4 Black Edition Honda Civic Type HKS Super SQV IV Blow Off Valve Universal All HKS available at HKS Super Sqv 4 Sequential Blow Off Valve Kit "Black Edition. HKS Super SQV (Sequential Blow Off Valve) uses a unique sequential valve structure and a differential pressure control system, which allows for a broad operating range from low boost to high boost. Its Pull Type relief design ensures stable operation regardless of the amount of boost pressure. This Super SQV maximizes the charge response that repeats pressure charging and pressurized air relief by throttle on and off and supports new generations of turbocharged vehicles. Factory recirculation valve sound cannot be noticed, but once HKS Super SQV IV is installed, its unique & sharp high frequency sound demonstrates its existence. The Super SQV IV significantly increases its presence and improve the engine compartment appearance. To match with the appearance created by HKS Intercooler Piping Kit, the buff polished casting pipe is included. By both the sound and appearance, Super SQV IV increases the fun to drive. Application: 2017+ Honda Civic Type R FK8 IMPORTANT EMISSIONS NOTE: This product does not have a CARB EO #; it is not legal for sale or use in CA on pollution controlled motor vehicles. This is intended as a "Race Only" product to be used solely for competition. It's use is limited to closed course and open course racing that is formally sanctioned by a recognized racing organization; any other use including recreational off road use, may be a violation of local, state and federal laws. It is the buyer's responsibility to verify legal use of this product for the intended application and use.