{"product_id":"active-autowerke-b58n-gesi-catted-downpipe-bmw-m340i-m440i-2025","title":"Active Autowerke B58N GESI Catted Downpipe – BMW M340i \/ M440i (2025+)","description":"\u003cstyle\u003e.sl-desc h2{font-size:1.15em;letter-spacing:.06em;text-transform:uppercase;border-bottom:2px solid #111;padding-bottom:6px;margin:1.6em 0 .7em}.sl-desc h3{font-size:1em;margin:1.2em 0 .4em}.sl-desc ul{margin:0 0 1em 1.2em}.sl-desc li{margin:.25em 0}.va-table{width:100%;border-collapse:collapse;margin:.5em 0 1em;font-size:.95em}.va-table th{text-align:left;padding:10px 8px;border-bottom:2px solid #333;white-space:nowrap}.va-table td{padding:8px;border-bottom:1px solid #e5e5e5;vertical-align:top}.sl-note{font-size:.9em;color:#555;margin:.4em 0 1em}\u003c\/style\u003e\u003cdiv class=\"sl-desc\"\u003e\n\u003ch2\u003eOVERVIEW\u003c\/h2\u003e\n\u003cp\u003eThis Active Autowerke downpipe is engineered for the 2025-and-newer B58N (Gen-3) M340i and M440i, which use an integrated gasoline particulate filter. It replaces the factory GPF downpipe with a 5 inch stainless steel unit running a GESI high-flow catalyst, joined by a cast V-band and tapering to the OEM 80mm connection.\u003c\/p\u003e\n\u003cp\u003eTIG-welded from 304 stainless steel with a 1.5mm wall, rated for builds up to 1000 horsepower, with no check-engine light and no performance tune needed.\u003c\/p\u003e\n\u003ch2\u003eSPECS\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e5\" GESI G-Sport Ultra High Output catalytic converter, 400 cells per square inch — catted, no CEL\u003c\/li\u003e\n\u003cli\u003e5\" stainless steel, cast upper stainless V-band, stainless flex joint, tapering to 80mm OEM connection (never below the stock 80mm)\u003c\/li\u003e\n\u003cli\u003e304 stainless steel, TIG-welded, 1.5mm wall; full 304 stainless converter including substrate, furnace-brazed to the mantle\u003c\/li\u003e\n\u003cli\u003eRated for builds up to 1000 hp\u003c\/li\u003e\n\u003cli\u003eWithstands up to 1500°F; reaches operating efficiency within 9 seconds of start-up\u003c\/li\u003e\n\u003cli\u003eBolts on — no cutting or welding required; no performance tune needed\u003c\/li\u003e\n\u003cli\u003eEPA registered and fully OBD2 compliant (1996 and newer) in 49 states — not legal in California\u003c\/li\u003e\n\u003cli\u003eWarranty: 5 yr \/ 50,000 mi on shell and tube ends; 2 yr \/ 25,000 mi on the catalytic core; original purchaser only; void with louder-than-stock burble\u003c\/li\u003e\n\u003cli\u003eMade in Miami, Florida\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePARTS INCLUDED\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCatted downpipe with integrated GESI catalyst\u003c\/li\u003e\n\u003cli\u003eCast V-band connection\u003c\/li\u003e\n\u003cli\u003eTurbo flange gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTECH RESOURCES\u003c\/h2\u003e\n\u003ch3\u003eAdditional Parts Required\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eNone.\u003c\/strong\u003e Bolt-on; no cutting or welding, and Active Autowerke states no performance tune is needed.\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/active-autowerke-catalytic-converter-break-in-instructions.pdf?v=1787172533\"\u003eActive Autowerke catalytic converter break-in instructions (PDF)\u003c\/a\u003e — follow this procedure on first start-up to avoid a check engine light being set in error.\u003c\/li\u003e\n\u003cli\u003eReplaces the OEM GPF downpipe; removing the stock GPF downpipe takes roughly 9–10 hours because the subframe must be dropped. Professional installation is required. Speed Logic offers professional installation — \u003ca href=\"\/pages\/contact-us\"\u003econtact us to schedule an install\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFits 2025+ B58N M340i \/ M440i only.\u003c\/li\u003e\n\u003cli\u003eFitment applies to US-model cars only.\u003c\/li\u003e\n\u003cli\u003eEPA compliant in 49 states; not legal for sale or use in California (California Vehicle Code Sections 27156 and 38391).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePART NUMBER\u003c\/h2\u003e\n\u003cul\u003e\u003cli\u003e\u003cstrong\u003e11-062G\u003c\/strong\u003e\u003c\/li\u003e\u003c\/ul\u003e\n\u003ch2\u003eVEHICLE APPLICATIONS\u003c\/h2\u003e\n\u003ctable class=\"va-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eChassis\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM340i\u003c\/td\u003e\n\u003ctd\u003eG20\u003c\/td\u003e\n\u003ctd\u003eB58N 3.0L Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2025+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM440i\u003c\/td\u003e\n\u003ctd\u003eG22 \/ G23 \/ G26\u003c\/td\u003e\n\u003ctd\u003eB58N 3.0L Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2025+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"Active Autowerke","offers":[{"title":"Default Title","offer_id":52563477397784,"sku":"11-062G","price":2449.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/b58ga_cd453195-6df5-447f-be43-34419f9503b8.jpg?v=1787607244","url":"https:\/\/speedlogicauto.com\/products\/active-autowerke-b58n-gesi-catted-downpipe-bmw-m340i-m440i-2025","provider":"SPEED LOGIC","version":"1.0","type":"link"}