{"product_id":"99-00-honda-civic-si-em1-4-1-style-header-stainless-steel","title":"99-00 Honda Civic SI EM1 4-1 Style Header Stainless Steel","description":"\u003cdiv class=\"product-container\"\u003e\n\u003ch6 class=\"product-title\"\u003e99-00 Honda Civic SI EM1 4-1 Style Header Stainless Steel\u003c\/h6\u003e\n\u003cdiv class=\"product-intro\"\u003e\n\u003cp class=\"lead-text\"\u003e\u003cstrong\u003eStainless steel 4-1 header built for the EM1 platform to improve exhaust scavenging and flow.\u003c\/strong\u003e This header consolidates four runners into one outlet, reducing backpressure and freeing up power in the midrange. Constructed from mandrel-bent stainless steel for durability and corrosion resistance.\u003c\/p\u003e\n\u003cdiv class=\"trust-indicators\"\u003e\n\u003cspan class=\"badge\"\u003e✓ Stainless Steel Construction\u003c\/span\u003e \u003cspan class=\"badge\"\u003e✓ 4-1 Collector Design\u003c\/span\u003e \u003cspan class=\"badge\"\u003e✓ Ships from FL Warehouse\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch6 class=\"section-title\"\u003eKey Features\u003c\/h6\u003e\n\u003cdiv class=\"design-features\"\u003e\u003cul class=\"feature-list\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMandrel-bent runners\u003c\/strong\u003e - Smooth curves maximize flow without dead zones or turbulence.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle outlet collector\u003c\/strong\u003e - 4-1 design consolidates exhaust gas for better spool characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel construction\u003c\/strong\u003e - Won't rust or corrode over time, maintains performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/div\u003e\n\u003ch6 class=\"section-title\"\u003eSpecs\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003eMaterial: Stainless Steel\u003c\/li\u003e\n\u003cli\u003eConfiguration: 4-1 collector design\u003c\/li\u003e\n\u003cli\u003eCondition: New\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch6 class=\"section-title\"\u003eWhats Included\u003c\/h6\u003e\n\u003cul\u003e\n\u003cli\u003e4-1 header assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"product-faq\"\u003e\n\u003ch6 class=\"section-title\"\u003eFrequently Asked Questions\u003c\/h6\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp\u003e\u003cstrong\u003eWill this bolt directly to my exhaust manifold gasket and studs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, this header uses factory mounting points on the cylinder head. You'll need new gaskets and studs are reusable if they're not stripped — grab fresh ones to be safe.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to prime or paint this header before installation?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStainless steel won't rust, so paint or ceramic coating is purely cosmetic. If you want it coated for looks, do it before you bolt it on — easier to handle and cure without heat cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp\u003e\u003cstrong\u003eWill I need custom exhaust piping to connect this to my downstream system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCheck your outlet diameter against your current exhaust piping. If there's a mismatch, you may need an adapter or custom section — measure before ordering any secondary work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"K2 Industries","offers":[{"title":"Default Title","offer_id":48609987526839,"sku":"K2-4916-HON-006-EC","price":199.99,"currency_code":"USD","in_stock":false}],"url":"https:\/\/milkymotorsports.com\/products\/99-00-honda-civic-si-em1-4-1-style-header-stainless-steel","provider":"Milky Motorsports","version":"1.0","type":"link"}