{"product_id":"active-autowerke-b58n-aflow-catted-downpipe-bmw-m340i-m440i-2025","title":"Active Autowerke B58N AFlow Catted Downpipe – BMW M340i \/ M440i (2025+)","description":"\u003cdiv class=\"sl-desc\"\u003e\n\u003ch2\u003eOVERVIEW\u003c\/h2\u003e\n\u003cp\u003eThis Active Autowerke downpipe fits the 2025-and-newer B58N (Gen-3) M340i and M440i with integrated GPF. It replaces the factory GPF downpipe with a 5 inch stainless steel unit running Active Autowerke's in-house AFlow 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, rated to withstand 1500°F and reach catalytic efficiency within about 9 seconds, for builds up to 950 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\" Active AFlow high-flow catalytic converter (in-house, not GESI), 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\u003c\/li\u003e\n\u003cli\u003eRated for builds up to 950 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 AFlow downpipe\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\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/community\/contact?service=Parts+Install\"\u003eRequest an Install Appointment\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReplaces the OEM GPF downpipe; removing the stock GPF downpipe takes roughly 9–10 hours because the subframe must be dropped.\u003c\/li\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\u003e11-062GA\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":52563477430552,"sku":"11-062GA","price":1899.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/b58ga.jpg?v=1787607244","url":"https:\/\/speedlogicauto.com\/products\/active-autowerke-b58n-aflow-catted-downpipe-bmw-m340i-m440i-2025","provider":"SPEED LOGIC","version":"1.0","type":"link"}