{"product_id":"manley-00-03-subaru-wrx-ej20-04-sti-exhaust-33mm-stainless-extreme-duty-valves","title":"Manley Extreme Duty Stainless Valves | Subaru WRX (EJ20) \/ 2004 STi (11139-8)","description":"\u003ch1\u003eManley Performance Manley 00-03 Subaru WRX (EJ20) \/ 04 STi Exhaust 33mm Stainless Extreme Duty Valves\u003c\/h1\u003e\n\u003ch2\u003eFitment Summary\u003c\/h2\u003e\n\u003c!-- No specific fitment details provided, so this section is omitted --\u003e\n\u003cp\u003e\u003cstrong\u003ePart #:\u003c\/strong\u003e 11139-8\u003c\/p\u003e\n\u003ch3\u003eOverview\u003c\/h3\u003e\nThe Manley Extreme Duty Series Valves are high-performance engine components designed to withstand the rigorous demands of racing and high-stress applications. Crafted from premium stainless steel, these valves are engineered for durability, heat resistance, and consistent performance under extreme conditions. They are ideal for enthusiasts and professional racers seeking to optimize their Subaru WRX and STI engines, especially in high-performance or modified setups. With their robust construction, these valves help maintain proper airflow, improve combustion efficiency, and support the engine’s overall reliability during demanding driving scenarios.\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\nDesigned with precision and durability in mind, these valves feature:\n\u003cul\u003e\n\u003cli\u003eConstructed from high-quality stainless steel for corrosion resistance and strength\u003c\/li\u003e\n\u003cli\u003eEngineered to handle high temperatures and aggressive valve timing\u003c\/li\u003e\n\u003cli\u003e33mm valve diameter optimized for performance applications\u003c\/li\u003e\n\u003cli\u003eExtreme duty design suitable for racing and high-stress environments\u003c\/li\u003e\n\u003cli\u003ePrecision-machined for perfect fit and sealing\u003c\/li\u003e\n\u003cli\u003eDesigned to support high RPM operation and aggressive cam profiles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eConstruction \u0026amp; Design\u003c\/h3\u003e\nThese valves are manufactured from stainless steel, offering excellent durability and heat resistance. The precise machining ensures optimal sealing and consistent performance, making them suitable for high-performance engine builds.\n\n\u003ch3\u003eDriving Feel \u0026amp; Feedback\u003c\/h3\u003e\nWhile primarily a performance upgrade, these valves contribute to smoother engine response and reliable operation at high RPMs, supporting a more engaged driving experience.\n\n\u003ch3\u003eInstallation \u0026amp; Fitment\u003c\/h3\u003e\nInstallation requires proper engine disassembly and precise fitting, typically performed by experienced technicians or enthusiasts familiar with Subaru engine modifications.\n\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\nThe package includes a set of stainless steel valves designed specifically for Subaru WRX (EJ20) models from 2000 to 2003 and 2004 STI models with a 33mm valve diameter, suitable for extreme duty applications.","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":51635928465695,"sku":"11139-8","price":506.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0229\/3877\/files\/group-9bbf2521-9d90-4653-83d5-f4bdc14f8ca6-800_be971f0a-f739-45e6-b251-c938f524976d.jpg?v=1771149037","url":"https:\/\/shop.wheelflip.com\/products\/manley-00-03-subaru-wrx-ej20-04-sti-exhaust-33mm-stainless-extreme-duty-valves","provider":"WheelFlip","version":"1.0","type":"link"}