{"product_id":"radium-engineering-fuel-pressure-regulator-2008-2021-subaru-wrx-sti-ej257-only-ra-series-kit","title":"Radium Engineering Fuel Pressure Regulator Kit – 2008–2021 Subaru WRX STI EJ257","description":"\u003cp\u003eRadium Engineering developed the \u003cstrong\u003eFuel Pressure Regulator Kit\u003c\/strong\u003e for \u003cstrong\u003e2008–2021 Subaru WRX STI EJ257\u003c\/strong\u003e around the needs of modified street and competition cars, where component compatibility and clean system layout matter as much as outright capacity.\u003c\/p\u003e\u003ch3\u003eWhy This Upgrade Matters\u003c\/h3\u003e\u003cp\u003eFuel pressure control is fundamental to injector consistency and repeatable tuning. A regulator must manage return flow while maintaining the pressure strategy required by the injectors and ECU, particularly as pump flow and engine demand increase.\u003c\/p\u003e\u003ch3\u003eProduct-Specific Details\u003c\/h3\u003e\u003cp\u003eRadium Engineering 08-21 Subaru WRX STi (EJ257 Only) RA-Series Fuel Pressure Regulator Kit\u003c\/p\u003e\u003ch3\u003eFitment \u0026amp; Application\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e 2008–2021 Subaru WRX STI EJ257\u003cbr\u003e\u003cstrong\u003eFitment style:\u003c\/strong\u003e Application-Specific\u003c\/p\u003e\u003ch3\u003eTechnical Notes\u003c\/h3\u003e\u003cp\u003eBase pressure should be set with the system configured as required by the engine management strategy. Pump flow affects the regulator' operating range, and boosted applications may require a manifold-reference connection where the specific regulator supports it.\u003c\/p\u003e\u003ch3\u003eRadium Part Number\u003c\/h3\u003e\u003cp\u003e\u003ccode\u003eRAD20-0965\u003c\/code\u003e\u003c\/p\u003e\u003ch3\u003eEnthusiast Notes\u003c\/h3\u003e\u003cp\u003eFor tuned cars, stable pressure is part of stable fueling. Set the regulator with a gauge or sensor and validate pressure behavior under load rather than assuming the static setting tells the whole story.\u003c\/p\u003e\u003ch3\u003eBefore Ordering\u003c\/h3\u003e\u003cp\u003eConfirm required base-pressure range, total pump flow, feed\/return port sizes and whether vacuum\/boost reference is required. A regulator should be sized as part of the complete fuel system.\u003c\/p\u003e","brand":"Radium Engineering","offers":[{"title":"Default Title","offer_id":50230224486650,"sku":"RAD20-0965","price":256.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0325\/6352\/7739\/files\/a98c4f8e3177b1dac604b535c37bcce7L.jpg?v=1762454421","url":"https:\/\/lgcracing.com\/products\/radium-engineering-fuel-pressure-regulator-2008-2021-subaru-wrx-sti-ej257-only-ra-series-kit","provider":"Legacy Racing","version":"1.0","type":"link"}