{"id":9970435293424,"title":"2015.5-2016 GM 6.6L Duramax High-Flow 304 Stainless Steel Down Pipe","handle":"high-flow-304-stainless-steel-down-pipe-2015-pt-5-2016-gm-6-6l-duramax","description":"\u003ch2\u003eHigh-Flow 304 Stainless Steel Down Pipe\u003c\/h2\u003e\n\u003cp\u003eThe factory LML down pipe makes an abrupt directional change immediately after the turbine flange, which restricts exhaust flow and impedes performance. The indentations in the piping can further impede exhaust flow.\u003c\/p\u003e\n\u003cp\u003eUpgrade your Duramax with the PPE Free-Flow Downpipe and eliminate the rusted, restrictive factory design. The PPE Down Pipe highlights unrestricted 3-inch diameter flow path all-along, fully machined and TIG welded upper and lower flanges, and three-inch 304 stainless steel piping. It ensures smooth transitions for unobstructed exhaust flow. To further enhance performance, it comes with a woven titanium sleeve that effectively insulates heat, protecting the engine bay.\u003c\/p\u003e\n\u003cp\u003e\u003cimg width=\"500\" alt=\"High-Flow 304 Stainless Steel Down Pipe, 2015.5-2016 GM 6.6L Duramax\" src=\"https:\/\/ppepower.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353241_1200x.jpg?v=1743704811\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Only compatible with LML trucks with a three-bolt flange at the connection to the exhaust pipe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e117000700 (M20-1.5 Sensor port) and (M14-1.5 Sensor port)\u003c\/strong\u003e\u003c\/p\u003e","published_at":"2026-04-04T18:41:13-07:00","created_at":"2026-04-04T18:41:13-07:00","vendor":"Pacific Performance Engineering","type":"","tags":["2015-chevrolet-silverado-3500hd-8-cyl-6-6-liter-turbo-esi1890262","2015-gmc-sierra-2500hd-8-cyl-6-6-liter-turbo-esi1633551","2015-gmc-sierra-3500hd-8-cyl-6-6-liter-turbo-esi7943233","2016-chevrolet-silverado-2500hd-8-cyl-6-6-liter-turbo-esi7752593","2016-chevrolet-silverado-2500hd-8-cyl-6-6-liter-turbo-esr4985574","2016-chevrolet-silverado-3500hd-8-cyl-6-6-liter-turbo-esi4667560","2016-gmc-sierra-2500hd-8-cyl-6-6-liter-turbo-esi2982779","2016-gmc-sierra-3500hd-8-cyl-6-6-liter-turbo-esi5635040","GM","Intake\/Turbo\/Exhaust"],"price":17999,"price_min":17999,"price_max":17999,"available":true,"price_varies":false,"compare_at_price":0,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":49501507748080,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"117000700","requires_shipping":true,"taxable":true,"featured_image":null,"available":true,"name":"2015.5-2016 GM 6.6L Duramax High-Flow 304 Stainless Steel Down Pipe","public_title":null,"options":["Default Title"],"price":17999,"weight":3629,"compare_at_price":0,"inventory_quantity":0,"inventory_management":null,"inventory_policy":"deny","barcode":null,"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353870.jpg?v=1775353275","\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353324.jpg?v=1775353275","\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353241.jpg?v=1775353276"],"featured_image":"\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353870.jpg?v=1775353275","options":["Title"],"media":[{"alt":null,"id":44161586659568,"position":1,"preview_image":{"aspect_ratio":1.0,"height":1200,"width":1200,"src":"\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353870.jpg?v=1775353275"},"aspect_ratio":1.0,"height":1200,"media_type":"image","src":"\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353870.jpg?v=1775353275","width":1200},{"alt":null,"id":44161586692336,"position":2,"preview_image":{"aspect_ratio":1.0,"height":1200,"width":1200,"src":"\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353324.jpg?v=1775353275"},"aspect_ratio":1.0,"height":1200,"media_type":"image","src":"\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353324.jpg?v=1775353275","width":1200},{"alt":null,"id":44161586725104,"position":3,"preview_image":{"aspect_ratio":1.0,"height":1200,"width":1200,"src":"\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353241.jpg?v=1775353276"},"aspect_ratio":1.0,"height":1200,"media_type":"image","src":"\/\/www.hitechclassics.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353241.jpg?v=1775353276","width":1200}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003ch2\u003eHigh-Flow 304 Stainless Steel Down Pipe\u003c\/h2\u003e\n\u003cp\u003eThe factory LML down pipe makes an abrupt directional change immediately after the turbine flange, which restricts exhaust flow and impedes performance. The indentations in the piping can further impede exhaust flow.\u003c\/p\u003e\n\u003cp\u003eUpgrade your Duramax with the PPE Free-Flow Downpipe and eliminate the rusted, restrictive factory design. The PPE Down Pipe highlights unrestricted 3-inch diameter flow path all-along, fully machined and TIG welded upper and lower flanges, and three-inch 304 stainless steel piping. It ensures smooth transitions for unobstructed exhaust flow. To further enhance performance, it comes with a woven titanium sleeve that effectively insulates heat, protecting the engine bay.\u003c\/p\u003e\n\u003cp\u003e\u003cimg width=\"500\" alt=\"High-Flow 304 Stainless Steel Down Pipe, 2015.5-2016 GM 6.6L Duramax\" src=\"https:\/\/ppepower.com\/cdn\/shop\/files\/2015.5-2016-GM-6.6L-Duramax-Three-Inch-304-Stainless-Steel-Down-Pipes-Pacific-Performance-Engineering-134353241_1200x.jpg?v=1743704811\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Only compatible with LML trucks with a three-bolt flange at the connection to the exhaust pipe.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e117000700 (M20-1.5 Sensor port) and (M14-1.5 Sensor port)\u003c\/strong\u003e\u003c\/p\u003e"}