{"product_id":"granatelli-50mm-viper-series-adjustable-atmospheric-turbo-blow-540198","title":"Granatelli 50mm Viper Series Adjustable Atmospheric Turbo Blow-Off Valve – 540198","description":"\u003cdiv class=\"gms-boost-product\"\u003e\n\n\u003cdiv style=\"border:2px solid #777; border-radius:12px; padding:26px; margin-bottom:22px; background:#eeeeee; box-shadow:0 4px 12px rgba(0,0,0,0.07);\"\u003e\n\u003cp style=\"font-size:13px; font-weight:900; letter-spacing:1.5px; color:#555; margin:0 0 7px;\"\u003eGRANATELLI VIPER SERIES\u003c\/p\u003e\n\n\u003ch2 style=\"font-size:27px; line-height:1.3; font-weight:900; margin:0 0 10px;\"\u003eFAST PRESSURE RELEASE, ADJUSTABLE RESPONSE — AND YES, IT MAKES THE RIGHT NOISE.\u003c\/h2\u003e\n\n\u003cp style=\"font-size:16px; line-height:1.7; margin:0 0 10px;\"\u003eThe \u003cstrong\u003eGranatelli 540198 Viper Series 50mm Blow-Off Valve\u003c\/strong\u003e is a high-flow \u003cstrong\u003event-to-atmosphere turbo BOV\u003c\/strong\u003e designed for street, street\/strip and race applications.\u003c\/p\u003e\n\n\u003cp style=\"font-size:15px; line-height:1.7; margin:0;\"\u003eIts adjustable spring preload lets the valve response be tailored to the vacuum and boost characteristics of the specific turbo system, while the 50mm valve provides fast pressure relief when the throttle closes.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ctable style=\"width:100%; border-collapse:separate; border-spacing:10px; margin-bottom:22px;\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"width:33.3%; padding:18px; border:2px solid #858585; border-radius:10px; text-align:center; background:#e8e8e8;\"\u003e\n\u003cstrong style=\"font-size:21px;\"\u003e50MM\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:13px;\"\u003eHigh-Flow BOV\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width:33.3%; padding:18px; border:2px solid #858585; border-radius:10px; text-align:center; background:#e8e8e8;\"\u003e\n\u003cstrong style=\"font-size:21px;\"\u003eADJUSTABLE\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:13px;\"\u003eSpring Preload\u003c\/span\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width:33.3%; padding:18px; border:2px solid #858585; border-radius:10px; text-align:center; background:#e8e8e8;\"\u003e\n\u003cstrong style=\"font-size:19px;\"\u003eATMOSPHERIC\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:13px;\"\u003eVent-to-Atmosphere\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003cdiv style=\"border:2px solid #8d8d8d; border-radius:12px; padding:22px; margin-bottom:22px; background:#eeeeee;\"\u003e\n\u003ch3 style=\"font-size:21px; font-weight:900; margin:0 0 9px;\"\u003eWhat Makes the Viper Different?\u003c\/h3\u003e\n\n\u003cp style=\"font-size:15px; line-height:1.7; margin:0;\"\u003eThe Viper combines a 50mm high-flow valve with externally adjustable spring preload. This allows the \u003cstrong\u003eblow-off valve response\u003c\/strong\u003e to be fine-tuned to the engine’s vacuum characteristics and turbo boost setup rather than relying on one fixed calibration.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:2px solid #8d8d8d; border-radius:12px; padding:22px; margin-bottom:22px; background:#eaeaea;\"\u003e\n\u003ch3 style=\"font-size:21px; font-weight:900; margin:0 0 10px;\"\u003eIs the Viper Right for Your Setup?\u003c\/h3\u003e\n\n\u003ctable style=\"width:100%; border-collapse:separate; border-spacing:8px;\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"width:50%; vertical-align:top; padding:15px; border:1px solid #aaa; border-radius:8px; background:#f8f8f8;\"\u003e\n\u003cstrong\u003eGOOD FOR\u003c\/strong\u003e\u003cbr\u003e• Turbo street cars\u003cbr\u003e• High-boost builds\u003cbr\u003e• Drag and race cars\u003cbr\u003e• Adjustable BOV setups\u003cbr\u003e• Vent-to-atmosphere systems\u003c\/td\u003e\n\n\u003ctd style=\"width:50%; vertical-align:top; padding:15px; border:1px solid #aaa; border-radius:8px; background:#f8f8f8;\"\u003e\n\u003cstrong\u003eVERIFY FIRST\u003c\/strong\u003e\u003cbr\u003e• Atmospheric venting compatibility\u003cbr\u003e• BOV mounting flange\u003cbr\u003e• Vacuum reference source\u003cbr\u003e• Engine-management strategy\u003cbr\u003e• Available charge-pipe space\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:2px solid #888; border-radius:12px; padding:22px; background:#efefef; margin-bottom:22px;\"\u003e\n\u003ch3 style=\"font-size:21px; font-weight:900; margin:0 0 12px;\"\u003eProduct Specifications\u003c\/h3\u003e\n\n\u003ctable style=\"width:100%; border-collapse:collapse; background:#fafafa;\"\u003e\u003ctbody\u003e\n\u003ctr style=\"background:#e3e3e3;\"\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e540198\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003eTurbo Blow-Off Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#e3e3e3;\"\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e\u003cstrong\u003eValve Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e\u003cstrong\u003eDischarge Style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003eVent-to-Atmosphere\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#e3e3e3;\"\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e\u003cstrong\u003eAdjustment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003eAdjustable Spring Preload\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003eBillet Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#e3e3e3;\"\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:10px; border:1px solid #aaa;\"\u003eUniversal Custom Turbo Applications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"border:2px solid #ad9642; border-radius:12px; background:#f5edcf; padding:18px 20px;\"\u003e\n\u003cstrong\u003eMAF VEHICLE NOTE:\u003c\/strong\u003e A vent-to-atmosphere blow-off valve can affect drivability on some mass-airflow-metered vehicles because previously measured air is released from the charge system. Verify your engine-management configuration before installation.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\u003chr\u003e\u003ch3 style=\"margin-bottom:10px; color:#CC0000;\"\u003eKey Features \u0026amp; Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eApplication-focused Granatelli Motor Sports design\u003c\/li\u003e\n\u003cli\u003eBuilt for dependable performance and service\u003c\/li\u003e\n\u003cli\u003eDesigned for enthusiasts, professional installers, and performance builds\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3 style=\"margin-bottom:10px; color:#CC0000;\"\u003eFitment \u0026amp; Installation\u003c\/h3\u003e\u003cp\u003eConfirm the part number, vehicle or engine application, dimensions, and supporting components before installation. Modified vehicles may require additional clearance, fabrication, calibration, or related hardware depending on the combination.\u003c\/p\u003e\u003chr\u003e\u003ch3 style=\"margin-bottom:10px; color:#CC0000;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does a blow-off valve do?\u003c\/strong\u003e\u003cbr\u003eA blow-off valve releases excess charge pressure when the throttle closes, helping manage pressure in the intake tract.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this work on a modified vehicle?\u003c\/strong\u003e\u003cbr\u003eCompatibility depends on the complete vehicle combination. Confirm the listed application and supporting components before installation.\u003c\/p\u003e\u003chr\u003e\u003ch3 style=\"margin-bottom:10px; color:#CC0000;\"\u003eWhy Choose Granatelli Motor Sports?\u003c\/h3\u003e\u003cp\u003eGranatelli Motor Sports develops performance components for real-world street, street\/strip, race, and custom applications, with an emphasis on practical performance, dependable construction, and integration into serious automotive builds.\u003c\/p\u003e","brand":"Granatelli Motor Sports","offers":[{"title":"Default Title","offer_id":46910308417692,"sku":"540198","price":274.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0738\/9826\/2684\/files\/540198_6.png?v=1789580515","url":"https:\/\/granatellimotorsports.com\/products\/granatelli-50mm-viper-series-adjustable-atmospheric-turbo-blow-540198","provider":"Granatelli Motor Sports, Inc.","version":"1.0","type":"link"}