{"product_id":"advance-headers-holden-v8-commodore-vt-vz-high-performance-a317x","title":"Advance Headers | Mild Steel High Performance Tri-Y Extractors | Holden Commodore VTII-VZ LS1 LS2 5.7L 6.0L | A317X","description":"\u003ch2\u003eAdvance Headers High-Performance Mild Steel Tri-Y Extractors for Holden Gen III LS1 5.7L \u0026amp; Gen IV LS2 6.0L V8 Platforms\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eThe Advance Headers High-Performance Tri-Y Extractors (A317X) are the ultimate heavy-duty manifold upgrade for late-model Holden V8 muscle cars, utility workhorses, and luxury flagships. Specifically engineered with oversized pipelines to maximize gas flow velocity, this system is optimized for General Motors 5.7-Litre Gen III LS1 and 6.0-Litre Gen IV LS2\/L76\/L98 engine families. Covering VT Series II through VZ Commodore platforms, Monaro coupes, WH to WL Statesman sedans, and Crewman setups, this premium Tri-Y layout bridges the gap between everyday street driveability and aggressive track performance, unleashing maximum mid-range torque and an uncompromised, crisp LS V8 growl.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"feature-block\"\u003e\n\u003cdiv class=\"feature-content pb-6\"\u003e\n\u003ch3 style=\"color: #e60000; font-weight: bold;\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003ePRODUCT CONTENTS:\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Heavy-Duty Mild Steel High-Performance Left-Hand Tri-Y Header Assembly\u003c\/li\u003e\n\u003cli\u003e1 x Heavy-Duty Mild Steel High-Performance Right-Hand Tri-Y Header Assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdvanced High-Performance Tri-Y (4-2-1) configuration steps gas flow columns through specialized pairings to optimize exhaust scavenging velocity and torque punch\u003c\/li\u003e\n\u003cli\u003eHeavy-wall, mandrel-bent 1¾\" primary pipelines transition smoothly into massive 2\" secondary runners to eliminate backpressure restrictions entirely\u003c\/li\u003e\n\u003cli\u003eSubstantially optimizes low-to-mid range torque delivery and throttle response—ideal for rapid street acceleration, heavy towing configurations, and dyno-tuned setups\u003c\/li\u003e\n\u003cli\u003eHeavy-duty mild steel construction structurally built to handle intense thermal expansion cycles and extreme under-hood operating heat cycles safely\u003c\/li\u003e\n\u003cli\u003eThick, precision laser-cut cylinder head flanges maintain a flat, ultra-stable mating footprint to permanently guard against warping and high-pressure gas leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv class=\"specs\"\u003e\n\u003cul class=\"flex flex-col space-y-2 text-xs\"\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eBrand:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eAdvance Headers\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003ePart Number:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eA317X\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eMaterial:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eMild Steel (Standard Finish)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eExtractor Configuration:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eHigh-Performance Tri-Y (4-2-1) Design Layout\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003ePrimary Piping Size:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003e1¾\" (44.5mm)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eSecondary Piping Size:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003e2\" (50.8mm)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eEngine Suitability:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eGM Gen III LS1 (5.7L) \u0026amp; Gen IV LS2 \/ L76 \/ L98 (6.0L) V8 Petrol Only\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eEstimated Fitting Time:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003e2 Hours\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"text-gray-500 font-semibold mr-1\"\u003eWelding\/Modification Required:\u003c\/span\u003e \u003cspan class=\"text-gray-700\"\u003eModel dependent (See adaptation notes below)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e⚠️ Crucial Generation-Specific Compliance \u0026amp; Harness Warnings:\u003c\/strong\u003e\u003cbr\u003eDue to the oversized primary and secondary runner paths shifting the downstream outlet boundaries, the following fitment requirements must be adhered to:\u003cbr\u003e1. \u003cstrong\u003eVZ Models Catalytic Converter Relocation:\u003c\/strong\u003e On all VZ series variants (both 5.7L and 6.0L), the factory catalytic converters \u003cstrong\u003emust be physically cut, rotated, and re-positioned downstream\u003c\/strong\u003e to align correctly with the modified exit geometry of these high-performance collectors.\u003cbr\u003e2. \u003cstrong\u003e6.0-Litre V8 Sensor Wire Extension:\u003c\/strong\u003e When retrofitting this kit onto 6.0-Litre LS2\/L76\/L98 engine variations, you \u003cstrong\u003eMUST utilize 2 x Rear Oxygen Sensor Wiring Extensions (Part No. OSER)\u003c\/strong\u003e to bridge the factory loom safely down to the altered sensor bungs without stretching or damaging harness lines.\u003cbr\u003e3. \u003cstrong\u003eEngine Limitation Note:\u003c\/strong\u003e Mapped exclusively for aluminum GM Gen III\/IV block structures. Will not align with early VT Series I iron-block Holden 5.0L\/304 engines.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePlease Note: Due to the custom catalytic adjustments and sensor extensions required on later model profiles, professional installation by an exhaust specialist or a qualified performance workshop is highly recommended to guarantee proper alignment and a perfect leak-free seal.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eImportant Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThe image shown may not reflect the actual product design.\u003c\/li\u003e\n\u003cli\u003eEnsure your vehicle details match the application guide below before purchasing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"font-family: Arial, sans-serif; max-width: 100%; padding: 20px; border: 1px solid #ccc; border-radius: 5px; font-size: 1rem;\" class=\"product-details-container\"\u003e\n\u003ch2\u003eVehicle Applications for A317X Performance High-Flow Extractors\u003c\/h2\u003e\n\u003cdiv style=\"width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 10px;\"\u003e\n\u003ctable style=\"min-width: 1100px; border-collapse: collapse; font-size: 1rem; line-height: 1.5; width: 100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f0f0f0; border-bottom: 3px solid #333;\"\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eMake\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eYear Range Spec\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eBody Type\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eChassis Series\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eEngine Details\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd; white-space: nowrap;\"\u003eFitting Time\u003c\/th\u003e\n\u003cth style=\"padding: 10px 8px; text-align: left; border: 1px solid #ddd;\"\u003eDrivetrain \/ Modification Notes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eHolden\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eCommodore \/ Berlina \/ Calais \/ SS \/ \u0026amp; HSV\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e1999 – 2006\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e4-Door Sedan \/ 5-Door Station Wagon \/ Utility (Ute)\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eVT Series II \/ VX \/ VY \/ VZ Series\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e5.7L LS1 \u0026amp; 6.0L LS2 Gen III\/IV V8 Petrol Only\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e2.0 Hours\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eRWD | High-performance 1¾\" to 2\" Tri-Y configuration. **Note:** VZ models require catalytic converter repositioning modification. VZ 6.0L versions require 2x OSER harness extensions. Routes cleanly past factory steering gear.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eHolden\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eMonaro \/ CV8 \/ HSV Coupe\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e2001 – 2006\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e2-Door Sports Coupe Muscle Variant\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eV2 \/ VZ Series Only\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e5.7L LS1 \u0026amp; 6.0L LS2 Gen III\/IV V8 Petrol Only\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e2.0 Hours\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eRWD | Heavy-duty tubular geometry maps safely down past low steering columns and front subframes. Follow VZ adaptation rules if utilizing a final run VZ Monaro platform.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eHolden\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eStatesman \/ Caprice \/ HSV Grange\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e1999 – 2006\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eLong-Wheelbase (LWB) Luxury Sedan\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWH \/ WK \/ WL Series Only\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e5.7L LS1 \u0026amp; 6.0L LS2 Gen III\/IV V8 Petrol Only\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e2.0 Hours\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eRWD | Clears long-wheelbase floor footprints and downpipe routes cleanly. WL models running 6.0L gear must follow standard OSER extension guidelines.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eHolden\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap; font-weight: bold;\"\u003eCrewman \/ One Tonner\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e2003 – 2006\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e4-Door Dual Cab Utility \/ Cab Chassis Heavy Duty\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eVY \/ VZ Commercial Lines\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e5.7L LS1 \u0026amp; 6.0L LS2 Gen III\/IV V8 Petrol Only\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; white-space: nowrap;\"\u003e2.0 Hours\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eRWD \u0026amp; AWD | High-velocity oversized runners provide massive mid-range torque. Clearanced to route safely around wider commercial gear, automatic transmissions, and front transfer case limits on Cross 8 variants.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003ePayment \u0026amp; Security\u003c\/h2\u003e\n\u003cp\u003eYour payment information is processed securely. We do not store credit card details nor have access to your credit card information.\u003c\/p\u003e","brand":"Advance Headers","offers":[{"title":"Default Title","offer_id":45735853916322,"sku":"A317X","price":1002.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0576\/1112\/4898\/files\/GenericHeader_4e5c0414-728a-4c29-89fe-71b47d7fa5fb.png?v=1766995063","url":"https:\/\/nationaltowbars.com.au\/products\/advance-headers-holden-v8-commodore-vt-vz-high-performance-a317x","provider":"National Towbars Australia","version":"1.0","type":"link"}