{"product_id":"ppe-high-flow-exhaust-manifolds-with-up-pipes-116111400-2004-5-2005-6-6l-duramax-lly","title":"PPE HIGH-FLOW EXHAUST MANIFOLDS WITH UP-PIPES 116111400\/116111420\/116111435 | 2004.5-2005 6.6L Duramax LLY","description":"\u003cp\u003eIncrease exhaust flow and reduce backpressure in your 2004.5–2005 GM 6.6L Duramax LLY with the PPE 116111400, \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-sheets-root=\"1\"\u003e116111420, and \u003cmeta charset=\"utf-8\"\u003e116111435\u003c\/span\u003e High-Flow Exhaust Manifolds \u0026amp; Up-Pipes. Engineered to deliver improved performance and long-term durability, this system provides up to 20% greater exhaust flow than the factory components while maintaining 50-state emissions compliance.\u003c\/p\u003e\n\u003cp\u003eConstructed from high-quality cast iron, the manifolds are built to withstand years of demanding use. The included stainless steel up-pipes feature aircraft-grade internally sleeved bellows with an increased inner diameter to improve exhaust flow, reduce restriction, and enhance turbocharger efficiency.\u003c\/p\u003e\n\u003cp\u003eThe system is also equipped with built-in bosses that are pre-drilled and tapped for 1\/8-inch NPT EGT probes, making it easy to monitor exhaust gas temperatures in performance and towing applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncreases exhaust flow by up to 20%\u003c\/li\u003e\n\u003cli\u003eSignificantly reduces exhaust backpressure\u003c\/li\u003e\n\u003cli\u003eHigh-strength cast iron manifold construction\u003c\/li\u003e\n\u003cli\u003eHeavy-duty stainless steel up-pipes\u003c\/li\u003e\n\u003cli\u003eFree-flowing stainless steel inner liner bellows\u003c\/li\u003e\n\u003cli\u003eAircraft-grade internally sleeved bellows design\u003c\/li\u003e\n\u003cli\u003e11-gauge stainless steel up-pipes with .120-inch wall thickness\u003c\/li\u003e\n\u003cli\u003eBuilt-in bosses pre-drilled and tapped for 1\/8\" NPT EGT sensors\u003c\/li\u003e\n\u003cli\u003eDesigned for improved turbocharger performance and durability\u003c\/li\u003e\n\u003cli\u003e50-state emissions legal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEmissions Compliance:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCARB Executive Order: D-701-1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2004.5–2005 Chevrolet Silverado 2500HD\/3500HD 6.6L Duramax LLY\u003c\/li\u003e\n\u003cli\u003e2004.5–2005 GMC Sierra 2500HD\/3500HD 6.6L Duramax LLY\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Pacific Performance Engineering","offers":[{"title":"Raw","offer_id":52391100055835,"sku":"116111400","price":1121.39,"currency_code":"USD","in_stock":true},{"title":"Black","offer_id":52391100088603,"sku":"116111420","price":1292.38,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":52391100121371,"sku":"116111435","price":1292.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/5757\/3147\/files\/Screenshot2026-06-23at2.39.02PM.png?v=1782247284","url":"https:\/\/wwmperformance.com\/products\/ppe-high-flow-exhaust-manifolds-with-up-pipes-116111400-2004-5-2005-6-6l-duramax-lly","provider":"WWM Performance","version":"1.0","type":"link"}