{"product_id":"milltek-large-bore-downpipe-for-bmw-f80-m3-f82-m4-ssxbm1144","title":"Milltek Large-Bore Downpipe for BMW F80 M3 \/ F82 M4","description":"\u003cp\u003eMilltek Resonated Cat Back Large-Bore Downpipe for BMW F80 M3 and F82 M4 (S55 engine). This resonated secondary catalyst delete is engineered for direct fitment to Milltek cat-back exhaust systems, combining increased flow capacity with refined sound character. The larger bore diameter reduces backpressure and improves scavenging efficiency compared to OEM units.\u003c\/p\u003e\n\u003cp\u003eFabricated from T304L stainless steel with mandrel-bent construction, this downpipe features a high-flow catalyst bypass design. Installation requires Stage 2 ECU remap for optimal tuning. Uses OEM hangers and mounting points—no modification required. Compatible with all Milltek cat-back systems for this platform.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eT304L stainless steel construction\u003c\/li\u003e\n\u003cli\u003eMandrel-bent, seamless bore\u003c\/li\u003e\n\u003cli\u003eResonated design for refined exhaust note\u003c\/li\u003e\n\u003cli\u003eSecondary catalyst delete configuration\u003c\/li\u003e\n\u003cli\u003eDirect OEM+ fitment to Milltek cat-back exhausts\u003c\/li\u003e\n\u003cli\u003eRequires Stage 2 ECU remap\u003c\/li\u003e\n\u003cli\u003eS55 engine compatible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e Milltek downpipes are developed and tested to deliver measurable power gains without compromising drivability or longevity. \u003c\/p\u003e\n\u003cp\u003eFits Milltek Cat-Back.\u003c\/p\u003e\n\u003cp\u003eDesigned and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.\u003c\/p\u003e\n\u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n\u003cul class=\"fitment-list\"\u003e\n\u003cli\u003e2015-2018 BMW M3 Base\u003c\/li\u003e\n\u003cli\u003e2015-2018 BMW M4 Base\u003c\/li\u003e\n\u003cli\u003e2016 BMW M4 GTS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":60150722167070,"sku":"MILSSXBM1144","price":893.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXBM1144_1.jpg?v=1791254983","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-large-bore-downpipe-for-bmw-f80-m3-f82-m4-ssxbm1144","provider":"Signature Autohaus","version":"1.0","type":"link"}