{"product_id":"exhaust-header-downpipe-for-1989-1994-nissan-240sx-s13-jdm-2-4l","title":"High-Flow Exhaust Header \u0026 Downpipe for 1991-1994 Nissan 240SX 2.4L S13 KA24DE","description":"\u003ch3\u003eMaximize NA Power: 4-1 Stainless Steel KA24DE Headers \u0026amp; Downpipe\u003c\/h3\u003e\n\u003cp\u003eIf you're building an S13, you already know the factory cast iron exhaust manifold is a massive bottleneck. The Flashark KA24DE headers and downpipe combo is engineered specifically to fix that. Designed for the 1991-1994 Nissan 240SX 2.4L DOHC, this 4-1 stainless steel exhaust system dramatically reduces backpressure, giving your KA engine the breathing room it needs to make real naturally aspirated (NA) power.\u003c\/p\u003e\n\u003cp\u003eBy pairing precision mandrel-bent tubes with smooth transitions, this setup maximizes exhaust scavenging. The result? A sharper throttle response, noticeable mid-to-top-end horsepower gains, and an aggressive exhaust tone that actually sounds like a proper JDM build.\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy Upgrade Your 240SX Exhaust?\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Flow (4-1 Design):\u003c\/strong\u003e Unlike the restrictive factory KA24DE exhaust manifold, our 4-1 tubular header design merges all four cylinders into a single collector. This optimizes exhaust gas velocity, ideal for peak horsepower on the track or street.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On Fitment:\u003c\/strong\u003e No cutting or custom fabrication required. This header and downpipe system mounts perfectly to the S13 chassis and lines up with most aftermarket 240SX exhaust setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt to Last:\u003c\/strong\u003e Constructed from mirror-polished stainless steel to resist corrosion and handle extreme exhaust gas temperatures (EGTs).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eO2 Sensor Ready:\u003c\/strong\u003e Includes a pre-welded O2 sensor bung so your ECU maintains proper air\/fuel ratios without throwing check engine lights.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand Name: \u003c\/strong\u003eFlashark\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertificate: \u003c\/strong\u003eISO9001:2000\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e \u003ca href=\"https:\/\/flasharkracing.com\/collections\/exhaust-header\"\u003eExhaust Header\u003c\/a\u003e \u0026amp; Downpipe\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface:\u003c\/strong\u003e Mirror Polish\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlacement on Vehicle:\u003c\/strong\u003e Front (Replaces factory header and downpipe)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeader Inlet \/ Outlet Size (IN):\u003c\/strong\u003e 1.75\" \/ 2.5\"\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eO2 Sensor Bung Included: \u003c\/strong\u003eYes\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeader Style:\u003c\/strong\u003e 4-1 Exhaust System\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTuner's Guide: Headers vs. Downpipe vs. Exhaust Manifold\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eWe get a lot of questions about exhaust terminology. Here is what you need to know for your KA24DE build:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Manifold vs. Header:\u003c\/strong\u003e The stock \u003cem\u003eKA24DE exhaust manifold\u003c\/em\u003e is a heavy, cast-iron log. It's cheap to manufacture but terrible for airflow. A \u003cem\u003eheader\u003c\/em\u003e (like this one) uses individual, equal-length steel tubes for each cylinder. It's lighter and forces exhaust gases out faster, eliminating exhaust turbulence.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeaders vs. Downpipe:\u003c\/strong\u003e The header bolts directly to the engine block to collect exhaust gases. The \u003cem\u003edownpipe\u003c\/em\u003e connects the bottom of the header to the rest of your exhaust system (usually the catalytic converter or test pipe). Because our kit includes \u003cstrong\u003eboth the KA24DE header and the downpipe\u003c\/strong\u003e, you won't have to worry about mismatching flanges or hunting for separate parts. You get a complete, leak-free front exhaust solution.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Flashark","offers":[{"title":"Default Title","offer_id":51797507539230,"sku":"FLES08030","price":151.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7171\/1262\/files\/Exhaust-Header-_-Downpipe-for-1989-1994-Nissan-240SX-S13-JDM-2.4L-Flashark-1678947826.jpg?v=1777500104","url":"https:\/\/platinumhpsolutions.myshopify.com\/fr\/products\/exhaust-header-downpipe-for-1989-1994-nissan-240sx-s13-jdm-2-4l","provider":"Platinum High Performance Solutions, LLC.","version":"1.0","type":"link"}