{"product_id":"s58-downpipes","title":"S58 Downpipes - BMW G8X \/ G87","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003ePurpose-built downpipes for the S58 platform, fabricated in-house to replace the restrictive factory units and let the turbos breathe the way they were meant to.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eThe factory downpipes choke the S58 right off the turbine housing. Ours hold a full 3.0-inch cross-section from the outlet down, with a gradual taper only where it meets the mid-pipe, so flow is never pinched where it matters most. The result is reduced backpressure, faster spool, and a noticeably more aggressive exhaust note.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eEach pipe is hand-formed from T304 stainless steel and joined with fully back-purged TIG welds for clean internal flow and long-term durability under heat. Mandrel-bent tubing maintains cross-section through every bend, and smooth-radius routing keeps turbulence down where the factory design compromises.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003e200-Cell Catted or Non-Catted.\u003c\/strong\u003e The catted version runs high-flow 200-cell catalytic sections to cut emissions and tame volume for daily driving while still flowing far better than stock. Non-Catted deletes the catalytic sections entirely for maximum flow and the most aggressive tone. Non-catted is intended for off-road or race use and may not be emissions-compliant in all regions, so confirm local regulations before ordering.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eHeat-Wrapped or Bare.\u003c\/strong\u003e Both configurations are available wrapped in high-temperature thermal barrier or left as bare stainless. In a bay as tight as the S58's, the wrap's biggest job is heat management: it pulls a meaningful amount of radiant heat off everything packed around the turbos, including wiring, sensors, and the intake charge sitting nearby. Lower under-hood temps mean more consistent power on repeat pulls and less heat soak into surrounding components. Keeping that heat in the pipe also helps maintain exhaust velocity and scavenging downstream of the turbo. Bare stainless is the choice if you want the raw look under the hood or plan to run your own coating.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eDirect bolt-on with no cutting or modification required. Retains factory sensor locations and pairs with the \u003ca href=\"\/products\/g8x-mach1-midsection\"\u003eINR Mach-1 mid-section\u003c\/a\u003e for the full system.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eMaterial: T304 stainless steel\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eConstruction: full back-purged TIG welds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eTubing: 3.0-inch mandrel-bent, smooth-radius bends\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eConfigurations: 200-cell catted \/ Non-catted\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFinish options: Heat-wrapped (high-temp thermal barrier) \/ Bare stainless\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eHardware: all mounting hardware included\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFitment: 2021+ BMW G80\/G82 M3\/M4 (RWD and xDrive, incl. Competition), 2023+ BMW G87 M2.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"INR Fabrication","offers":[{"title":"Non-Catted \/ Yes","offer_id":48043757731892,"sku":"S58DPRES","price":694.99,"currency_code":"USD","in_stock":true},{"title":"Non-Catted \/ No","offer_id":48095357632564,"sku":null,"price":599.99,"currency_code":"USD","in_stock":true},{"title":"200-Cell High-Flow Catted \/ Yes","offer_id":48043757764660,"sku":"S58DPNON","price":1324.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0653\/1098\/2196\/files\/8.png?v=1785739833","url":"https:\/\/checkout.inrfab.com\/products\/s58-downpipes","provider":"INR FAB","version":"1.0","type":"link"}