{"product_id":"2001-2016-duramax-s400-3-5-stainless-steel-downpipe","title":"2001-2016 Duramax S400 3.5\" Stainless Steel Downpipe","description":"\u003cdiv style=\"border:3px solid #c0392b;background:#fff5f4;padding:18px 20px;margin:0 0 24px;border-radius:6px;\"\u003e\n\u003cp style=\"margin:0 0 10px;font-size:22px;line-height:1.25;font-weight:800;text-transform:uppercase;color:#c0392b;\"\u003eBuilt to order — not a shelf part\u003c\/p\u003e\n\u003cp style=\"margin:0 0 10px;font-size:19px;line-height:1.35;font-weight:700;color:#111111;\"\u003eCurrent build \u0026amp; coat time: \u003cspan style=\"color:#c0392b;\"\u003e4–14 business days\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;font-size:15px;line-height:1.5;color:#333333;\"\u003eEvery Felder Kustom Fabrication part is fabricated after your order is placed, so lead times run longer than off-the-shelf parts. Lead time varies with our current build queue — contact us before ordering if you need an exact date.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe \u003cstrong\u003eFKF 3.5\" Stainless Steel S400 Duramax Downpipe\u003c\/strong\u003e is a fully mandrel-bent 304 stainless downpipe for 2001-2016 Duramax trucks running an S400-frame charger on a 6.5\" tall pedestal. It bolts directly to your factory race pipe with no cutting, and unlike most S400 downpipes it does not come dented and does not need to be dented.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e304 3.5\" stainless steel construction\u003c\/li\u003e\n\u003cli\u003eBillet stainless 4.62\" (117mm) half marmon T4-style flange with clamp — fits Borg Warner S400 and Garrett G-Series 42 and 45\u003c\/li\u003e\n\u003cli\u003eBillet stainless lower downpipe flange — no cutting required, bolts directly to your factory race pipe\u003c\/li\u003e\n\u003cli\u003eTIG welded and back purged for strength and appearance\u003c\/li\u003e\n\u003cli\u003eDesigned to work with 6.5\" tall pedestals\u003c\/li\u003e\n\u003cli\u003eDoes not come dented and does not need denting, with the exception of extended length up pipes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e2001-2016 GM 2500HD \/ 3500HD trucks with the 6.6L Duramax (LB7, LLY, LBZ, LMM, LML) running an S400-frame turbocharger on a 6.5\" tall pedestal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFlange compatibility:\u003c\/strong\u003e Borg Warner S400, Garrett G-Series 42 and 45. Note that S200 and S300 turbine discharge flanges are 4.25\" marmon — close to the S400 T4 4.62\" but they will not clamp together. Measure before ordering.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the lead time on this downpipe?\u003c\/h3\u003e\n\u003cp\u003ePlease allow 4-14 business days for build time. This downpipe is built to order, not pulled from a shelf. Contact us before ordering if you need an exact date.\u003c\/p\u003e\n\u003ch3\u003eDo I have to cut my exhaust to fit it?\u003c\/h3\u003e\n\u003cp\u003eNo. The billet stainless lower flange bolts directly to your factory race pipe with no cutting required.\u003c\/p\u003e\n\u003ch3\u003eDoes this downpipe need to be dented for clearance?\u003c\/h3\u003e\n\u003cp\u003eNo. It does not come dented and does not need to be dented, with the exception of installs running extended length up pipes.\u003c\/p\u003e\n\u003ch3\u003eWhat turbo flange does it use?\u003c\/h3\u003e\n\u003cp\u003eA billet stainless 4.62\" (117mm) half marmon T4-style flange, which fits Borg Warner S400 and Garrett G-Series 42 and 45 turbochargers. A clamp is included.\u003c\/p\u003e\n\u003ch3\u003eWill it work with a pedestal other than 6.5\"?\u003c\/h3\u003e\n\u003cp\u003eThis downpipe is designed around a 6.5\" tall pedestal. Fitment on other pedestal heights is not guaranteed.\u003c\/p\u003e","brand":"Felder Kustom Fabrication","offers":[{"title":"Yes","offer_id":45159117127880,"sku":"sku-53589832007848","price":735.0,"currency_code":"CAD","in_stock":true},{"title":"No Thanks","offer_id":45159117160648,"sku":"sku-53589832040616","price":675.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0090\/2345\/5290\/files\/Photoroom_20250826_143642.jpg?v=1785719428","url":"https:\/\/blacksheepindustries.ca\/products\/2001-2016-duramax-s400-3-5-stainless-steel-downpipe","provider":"Black Sheep Industries Inc.","version":"1.0","type":"link"}