{"product_id":"performance-header-manifold-exhaust-for-mazda-rx-7-1979-1985-1-1l","title":"Performance Header Manifold Exhaust for Mazda RX-7 (1979-1985) 1.1L","description":"\u003ch2\u003eHigh-Flow Stainless Steel Header for 1979-1985 Mazda RX-7 (12A \/ FB)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat It Does:\u003c\/strong\u003e Replaces the restrictive factory cast-iron exhaust manifold with a mandrel-bent stainless steel header to optimize exhaust scavenging and increase volumetric efficiency in the 12A rotary engine.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock RX-7 Weakness\u003c\/h3\u003e\n\u003cp\u003eThe original equipment on the 1979-1985 Mazda RX-7 utilizes a heavy, cast-iron exhaust manifold that is highly susceptible to heat retention and internal turbulence. In the 12A rotary engine, exhaust gas temperatures are significantly higher than in traditional piston engines. The stock manifold’s restrictive internal diameters and \"thermal reactor\" design (common on early SA22C models) create immense backpressure. This bottleneck forces spent combustion gases to remain in the housing longer, leading to localized hot spots, increased risk of apex seal degradation, and a measurable loss in high-RPM horsepower. Furthermore, the factory cast units are prone to cracking under the extreme thermal cycling inherent to Wankel powerplants.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis performance header is engineered from high-grade stainless steel to provide a direct-flow path for exhaust gases. Featuring a 1-1 piping design with a 2.00\" inlet and a 2.50\" outlet, the assembly utilizes CNC-machined flanges to ensure a true, leak-free mating surface that resists warping under high heat. The TIG and MIG welded construction provides structural integrity for aggressive driving conditions. By transitioning to a mandrel-bent system, the header maintains a consistent internal diameter, which maximizes gas velocity and improves the scavenging effect—drawing more fresh air\/fuel mixture into the combustion chamber. This thermal management improvement reduces engine bay temperatures and mitigates the heat soak that often plagues the 12A's carburetor or early fuel injection components.\u003c\/p\u003e\n\n\u003chr\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1979-1985 Mazda RX-7 (Excluding Convertible)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px\"\u003e12A Rotary \/ FB (SA22C)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e100 hp \/ 105 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1979-1985 Mazda RX-7 GS\u003c\/li\u003e\n  \u003cli\u003e1979-1985 Mazda RX-7 GSL\u003c\/li\u003e\n  \u003cli\u003e1984-1985 Mazda RX-7 GSL-SE (12A Swapped or specific 1.1L configurations)\u003c\/li\u003e\n  \u003cli\u003eFits 1.1L 12A Naturally Aspirated Engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Mazda Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for the JDM purist, this header delivers the distinct, aggressive rotary exhaust note while providing the flow characteristics necessary for the 12A engine to breathe at high RPMs. It is an essential upgrade for maintaining the longevity and performance of the first-generation RX-7 platform.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":47978608197880,"sku":"DS-EG604D209","price":249.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-header-manifold-exhaust-for-mazda-rx-7-1979-1985-1-1l-1.jpg?v=1770870720","url":"https:\/\/performancechiptuning.com\/products\/performance-header-manifold-exhaust-for-mazda-rx-7-1979-1985-1-1l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}