{"product_id":"exhaust-headers-for-toyota-mr2-1990-1995-2-2l","title":"Exhaust Headers for Toyota MR2 (1990-1995) 2.2L Engine","description":"\u003ch2\u003eHigh-Flow 4-1 Stainless Steel Exhaust Headers for 1990-1995 Toyota MR2 (SW21\/5S-FE)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces the restrictive factory cast-iron manifold with a mandrel-bent 4-1 stainless steel system to optimize exhaust scavenging and increase volumetric efficiency on the naturally aspirated 2.2L engine.\u003c\/p\u003e\n\u003ch3\u003eThe Stock MR2 Exhaust Constraint\u003c\/h3\u003e\n\u003cp\u003eThe OEM manifold found on the SW21 Toyota MR2 is a heavy cast-iron unit designed primarily for manufacturing economy and cabin noise suppression rather than flow efficiency. Internally, the factory manifold features rough casting surfaces and sharp, non-optimized runner angles that create significant exhaust turbulence. This design forces the 5S-FE engine to work harder to push spent gases out of the cylinders, leading to increased backpressure and heat retention. Over time, these thermal cycles can lead to micro-fractures in the cast iron, further degrading performance and engine bay heat management.\u003c\/p\u003e\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis performance header is engineered from premium T-304 stainless steel, utilizing computerized mandrel bends to ensure a constant internal diameter throughout every curve. By transitioning from a restrictive log-style design to a tuned 4-1 collector, this system utilizes the kinetic energy of exhaust pulses to pull gases from the adjacent cylinders—a process known as scavenging. The 2.00\" primary inlets and 2.50\" collector outlet provide a high-velocity flow path that significantly reduces backpressure. Each flange is CNC-machined and TIG-welded for high-tensile strength and a flush, leak-free seal against the cylinder head, ensuring long-term durability under high-heat operating conditions.\u003c\/p\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\u003ctbody\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;\"\u003e1990-1995 Toyota MR2\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;\"\u003e5S-FE \/ SW21\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;\"\u003e130 hp \/ 145 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;\"\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1990-1995 Toyota MR2 SW21 Naturally Aspirated Models\u003c\/li\u003e\n\u003cli\u003eFits models with 2.2L 5S-FE l4 engines ONLY\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Toyota JDM Performance Standard\u003c\/h3\u003e\n\u003cp\u003eThe SW21 chassis is a legendary mid-engine platform that relies on balanced airflow to maintain its rev-happy characteristics. Upgrading to a stainless 4-1 header is a fundamental modification for the 5S-FE, allowing the engine to breathe more freely at the top of the power band while providing a more aggressive, mechanical exhaust note that complements the MR2's sport-tuned heritage.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48005135630584,"sku":"DS-EQKONM2WA","price":199.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-headers-for-toyota-mr2-1990-1995-2-2l-1.webp?v=1771541292","url":"https:\/\/performancechiptuning.com\/products\/exhaust-headers-for-toyota-mr2-1990-1995-2-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}