{"product_id":"2001-2016-gm-6-6l-duramax-high-flow-race-exhaust-manifolds-gaskets","title":"2001-2016 GM 6.6L DURAMAX HIGH FLOW RACE EXHAUST MANIFOLDS \u0026 GASKETS","description":"\u003ch2\u003e2001–2016 Duramax 6.6L High-Flow Race Exhaust Manifold Kit\u003c\/h2\u003e\n\u003cp\u003eImprove flow • Reduce backpressure • Increase performance\u003c\/p\u003e\n\u003cp\u003eUpgrade your 6.6L Duramax with our high-flow race exhaust manifold system, designed to replace the restrictive factory manifolds found on 2001–2016 trucks. This setup improves exhaust flow, lowers EGTs, and supports higher horsepower builds — whether you’re towing, daily driving, or running a full performance setup.\u003c\/p\u003e\n\u003ch3\u003eHigh-Flow Race Manifolds (Base Kit)\u003c\/h3\u003e\n\u003cp\u003eOur high-flow manifolds are engineered for maximum exhaust flow and durability. The base kit includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-flow cast manifolds\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRequired manifold bolts (Allen-style)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eGaskets \u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDirect bolt-on fit for 2001–2016 Duramax trucks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePerfect for customers who already have upgraded hardware or want a simple bolt-on replacement.\u003c\/p\u003e\n\u003ch3\u003eInstaller Kit (Highly Recommended)\u003c\/h3\u003e\n\u003cp\u003eUpgrade to the Installer Kit for the strongest and cleanest install possible. This kit includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eStainless steel manifold studs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e12-point stainless nuts for superior clamping force\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNew up-pipe to manifold bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCorrosion-resistant hardware designed not to rust\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStud-style manifold mounting for better sealing and easier maintenance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis kit replaces the standard Allen bolts with stainless studs that thread into the cylinder head, giving you a longer-lasting and more secure manifold installation.\u003c\/p\u003e\n\u003ch3\u003eOptional: Brand New Up-Pipes (Driver \u0026amp; Passenger Side)\u003c\/h3\u003e\n\u003cp\u003eFor customers wanting a full fresh setup, you can also option:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eNew passenger-side up-pipe\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNew driver-side up-pipe\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFully compatible with both the base manifold kit and Installer Kit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA great choice for trucks with higher mileage or trucks already apart for other upgrades.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose This Kit?\u003c\/h3\u003e\n\u003cp\u003eIncreased exhaust flow\u003c\/p\u003e\n\u003cp\u003eLower EGTs\u003c\/p\u003e\n\u003cp\u003eBetter turbo response\u003c\/p\u003e\n\u003cp\u003eOptional stainless hardware that won’t rust\u003c\/p\u003e\n\u003cp\u003eDirect fit for all 2001–2016 6.6L Duramax engines\u003c\/p\u003e\n\u003cp\u003ePerfect for stock, tuned, or fully-built setups\u003c\/p\u003e","brand":"H2 Supply Co","offers":[{"title":"YES \/ YES UP PIPES","offer_id":48264803254526,"sku":null,"price":965.0,"currency_code":"USD","in_stock":true},{"title":"YES \/ NO I HAVE MY OWN","offer_id":48264803287294,"sku":null,"price":765.0,"currency_code":"USD","in_stock":true},{"title":"NO \/ YES UP PIPES","offer_id":48264803320062,"sku":null,"price":825.0,"currency_code":"USD","in_stock":true},{"title":"NO \/ NO I HAVE MY OWN","offer_id":48264803352830,"sku":null,"price":625.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0809\/8008\/2942\/files\/8d132aab7c5be3f761fa848be20a263d.webp?v=1779836111","url":"https:\/\/h2supplyco.com\/products\/2001-2016-gm-6-6l-duramax-high-flow-race-exhaust-manifolds-gaskets","provider":"H2 Supply CO","version":"1.0","type":"link"}