{"product_id":"2006-2011-honda-civic-si-2-0l-k20z3-tri-y-header-stainless-steel-exhaust-manifold-high-performance-direct-fit-bolt-on-fg2-fd2-fd3-compatible","title":"2006-2011 Honda Civic Si 2.0L 4CYL K20Z3 FG2 FD4 FD3 Tri-Y Stainless Exhaust Header","description":"\u003cdiv class=\"xkv-product-description\"\u003e\n\n  \u003cp\u003e\n    This Tri-Y stainless steel exhaust header is designed for listed 2006–2011 Honda Civic Si 2.0L K20Z3 applications. It is intended as an exhaust manifold \/ header replacement or upgrade-style component for compatible Civic Si exhaust setups.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    Built from T304 stainless steel with a 4-2-1 racing-style Tri-Y layout, mandrel-bent tubing, polished TIG-welded construction, thick steel flanges, and gaskets as listed, this header is designed to support a secure exhaust path where compatible. Final fitment, sound, exhaust sealing, drivability, and performance results may vary depending on vehicle condition, exhaust layout, O2 sensor setup, installation quality, emissions setup, and supporting components.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eProduct Overview\u003c\/h3\u003e\n  \u003cp\u003e\n    This product is an exhaust header for compatible Honda Civic Si 2.0L K20Z3 applications. It is not a catback exhaust system, downpipe, turbo manifold, full exhaust system, or universal header kit. Please verify your exact model year, trim, engine code, chassis code, flange layout, O2 sensor position, exhaust connection, and emissions requirements before purchase.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Details\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Listed 2006–2011 Honda Civic Si 2.0L applications\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e K20Z3 2.0L 4-cylinder as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Tri-Y Exhaust Header \/ Exhaust Manifold Header\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e T304 stainless steel as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHeader Design:\u003c\/strong\u003e 4-2-1 racing-style Tri-Y layout as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInlet:\u003c\/strong\u003e 1-3\/4\" ports as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOutlet:\u003c\/strong\u003e 2\" flange end as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Mandrel-bent tubing with TIG-welded polished stainless steel construction as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFlanges:\u003c\/strong\u003e Thick steel flanges as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Gaskets included; OEM bolts may need to be reused as listed\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Professional installation highly recommended\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstruction:\u003c\/strong\u003e No installation instructions included\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUse Case:\u003c\/strong\u003e Off-road, racing, or closed-course use where emissions laws apply\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eFitment\u003c\/h3\u003e\n  \u003cp\u003e\n    Please use the table below to quickly confirm the main vehicle application listed for this header. Before ordering, verify your exact model year, trim, engine code, chassis code, exhaust layout, O2 sensor position, and emissions setup.\n  \u003c\/p\u003e\n\n  \u003cdiv class=\"xkv-fitment-table-wrap\"\u003e\n    \u003ctable class=\"xkv-fitment-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eVehicle Name\u003c\/th\u003e\n          \u003cth\u003eYear\u003c\/th\u003e\n          \u003cth\u003eEngine\u003c\/th\u003e\n          \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eHonda Civic Si\u003c\/td\u003e\n          \u003ctd\u003e2006–2011\u003c\/td\u003e\n          \u003ctd\u003e2.0L K20Z3\u003c\/td\u003e\n          \u003ctd\u003eVerify trim, chassis code, flange layout, O2 sensor position, and exhaust connection before purchase\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"xkv-fitment-note\"\u003e\n    \u003cstrong\u003eFitment Note:\u003c\/strong\u003e This table is based on the fitment information currently listed for this product. The page content references Civic Si 2.0L K20Z3 fitment and FG2 \/ FA5 applications. Please verify your exact chassis code, trim, engine code, O2 sensor layout, and exhaust connection before purchase.\n  \u003c\/div\u003e\n\n  \u003ch3\u003ePackage Includes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eTri-Y exhaust header component as shown\u003c\/li\u003e\n    \u003cli\u003eGaskets included as listed\u003c\/li\u003e\n    \u003cli\u003eOEM bolts may need to be reused as listed\u003c\/li\u003e\n    \u003cli\u003eHardware or additional accessories included only if shown or listed\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\n    Please review the product photos and listing details before installation. Confirm all included headers, gaskets, flanges, fasteners, and connection requirements against the received package before beginning installation.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eProfessional installation is highly recommended.\u003c\/li\u003e\n    \u003cli\u003eNo installation instructions are included.\u003c\/li\u003e\n    \u003cli\u003eTest fit the header before final tightening.\u003c\/li\u003e\n    \u003cli\u003eVerify cylinder head flange alignment, gasket seating, O2 sensor position, downstream exhaust connection, and engine bay clearance before installation.\u003c\/li\u003e\n    \u003cli\u003eCheck clearance around the engine bay, subframe, steering components, wiring, heat shields, and surrounding exhaust components.\u003c\/li\u003e\n    \u003cli\u003eOld, rusted, or seized factory hardware may increase installation difficulty.\u003c\/li\u003e\n    \u003cli\u003eModified exhaust systems, previous repairs, or non-factory configurations may require additional adjustment or compatible components.\u003c\/li\u003e\n    \u003cli\u003eInspect all exhaust connections for leaks after installation and recheck fasteners after initial heat cycles where appropriate.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eBefore You Buy\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eThis product is intended for listed 2006–2011 Honda Civic Si 2.0L K20Z3 applications only.\u003c\/li\u003e\n    \u003cli\u003eThis is a Tri-Y exhaust header, not a catback exhaust system, downpipe, turbo manifold, full exhaust system, or universal header kit.\u003c\/li\u003e\n    \u003cli\u003ePlease verify your exact model year, trim, engine code, chassis code, flange layout, O2 sensor position, exhaust connection, and emissions setup before purchase.\u003c\/li\u003e\n    \u003cli\u003eThis product may alter the factory exhaust or emissions-related configuration depending on the vehicle setup.\u003c\/li\u003e\n    \u003cli\u003eThis product is intended for off-road, racing, or closed-course use where emissions laws apply.\u003c\/li\u003e\n    \u003cli\u003eThis product is not represented as street legal, emissions-compliant, CARB-compliant, or legal for public road use unless explicitly stated.\u003c\/li\u003e\n    \u003cli\u003ePerformance gains, sound changes, exhaust flow changes, fitment, and drivability results are not guaranteed and may vary by setup.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e\n\n\u003cstyle\u003e\n  .xkv-product-description {\n    font-family: Arial, sans-serif;\n    line-height: 1.5;\n    color: #333;\n  }\n\n  .xkv-product-description h3 {\n    margin-top: 28px;\n    margin-bottom: 12px;\n    color: #062E94;\n    font-size: 20px;\n    font-weight: 700;\n  }\n\n  .xkv-product-description p {\n    margin-bottom: 14px;\n  }\n\n  .xkv-product-description ul {\n    margin: 0 0 18px 20px;\n    padding: 0;\n  }\n\n  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