{"product_id":"exhaust-manifold-header-kit-for-mg-midget-1975-1979-1-5l","title":"Exhaust Manifold Header Kit for MG Midget (1975-1979) 1.5L","description":"\u003ch2\u003eHigh-Flow Exhaust Manifold Header Kit for 1975-1979 MG Midget\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eReplaces the restrictive factory cast iron exhaust manifold to improve exhaust scavenging and lower engine bay temperatures.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Midget Exhaust Bottleneck\u003c\/h3\u003e\n\u003cp\u003eThe factory 1.5L Triumph engine in the late-model MG Midget suffers significantly from a heavy, restrictive cast iron exhaust manifold. This OEM design prioritizes mass production over airflow efficiency, leading to severe exhaust gas backpressure and excessive heat soak within the cramped engine bay. The original cast manifold creates turbulent collisions between exhaust pulses, preventing efficient cylinder scavenging. Over decades of continuous heat cycling, these aging cast units are also highly prone to hairline cracking at the collector and exhaust gasket blowouts, further robbing the Standard SC 1.5L engine of its limited horsepower and dulling overall throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis upgraded 4-to-1 exhaust header resolves the inherent restrictions of the factory casting through optimized tubular flow dynamics. Featuring a 1.25-inch primary inlet stepping up to a 2.00-inch collector outlet, the continuous piping design promotes high-velocity exhaust scavenging, effectively pulling spent gases from the combustion chamber. Constructed from corrosion-resistant stainless steel, the assembly utilizes thick CNC-machined flanges combined with robust TIG and MIG welding to ensure a warp-free, leak-proof seal against the cylinder head. The elimination of internal exhaust turbulence significantly reduces backpressure, translating to reliable gains of 5 to 10 horsepower and improved mid-range torque. By shedding the immense thermal mass of the OEM iron manifold, radiant under-hood temperatures decrease rapidly, protecting nearby vintage electronics and carburetor components.\u003c\/p\u003e\n\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;\"\u003e1975-1979 MG Midget\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;\"\u003eTriumph 1493cc I4 \/ GAN6\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;\"\u003e50 hp \/ 67 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\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1975 MG Midget 1.5L\u003c\/li\u003e\n  \u003cli\u003e1976 MG Midget 1.5L\u003c\/li\u003e\n  \u003cli\u003e1977 MG Midget 1.5L\u003c\/li\u003e\n  \u003cli\u003e1978 MG Midget 1.5L\u003c\/li\u003e\n  \u003cli\u003e1979 MG Midget 1.5L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe MG Performance Standard\u003c\/h3\u003e\n\u003cp\u003eUpgrading the exhaust on your classic British roadster restores the raw, mechanical driving experience it was engineered for. By optimizing exhaust gas velocity, you achieve a sharper throttle curve and a deeply resonant vintage exhaust note.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48634873512184,"sku":"DS-EKAI73FAV","price":319.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-manifold-header-kit-for-mg-midget-1975-1979-1-5l-1.webp?v=1779915281","url":"https:\/\/performancechiptuning.com\/fr\/products\/exhaust-manifold-header-kit-for-mg-midget-1975-1979-1-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}