{"product_id":"milltek-sport-bmw-g8x-m3-m4-opf-gpf-back-with-centre-resonator-bypass-system-with-jet-115-carbon-fibre-trims","title":"Milltek Sport BMW G8X M3\/M4 - OPF\/GPF Back with Centre Resonator Bypass System with JET-115 Carbon Fibre Trims","description":"\u003cp\u003eThe flagship Milltek Sport exhaust upgrade for the BMW M3 and M4 G8X — a full OPF\/GPF Back System with Centre Resonator Bypass, finished with premium carbon fibre JET-115 tips. Engineered to transform the acoustic and visual presence of the S58-powered G8X generation, this system represents the definitive Milltek Sport upgrade for M3 and M4 owners.\u003c\/p\u003e\u003cp\u003eThe centre resonator bypass section eliminates the factory resonator, dramatically improving the exhaust flow and delivering a significantly enhanced exhaust note under acceleration. Combined with the OPF\/GPF-Back design — which addresses the sound-dampening effects of the factory particulate filter — this system produces an exceptionally rich, characterful exhaust sound that truly reflects the performance of the S58 engine.\u003c\/p\u003e\u003cp\u003eCarbon fibre JET-115 tips add a motorsport-derived aesthetic, complementing the aggressive styling of the M3 and M4. The system fits all G8X variants — including OPF\/GPF-equipped European models, Non-OPF North American and ROW cars, M3 Touring, and xDrive models. Note: OE exhaust cutting required for installation on some variants.\u003c\/p\u003e\u003cp\u003eManufactured from 304L aircraft-grade stainless steel and made in the UK.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFitment: BMW M3 G80\/G81 (2020+) \u0026amp; M4 G82 (2020+) — OPF\/GPF \u0026amp; Non-OPF variants\u003c\/li\u003e\n\u003cli\u003ePipe diameter: 80mm\u003c\/li\u003e\n\u003cli\u003eTip style: Carbon fibre JET-115 round tips\u003c\/li\u003e\n\u003cli\u003eRace product: No (road-legal)\u003c\/li\u003e\n\u003cli\u003eFitting time: 1.5–2 hours\u003c\/li\u003e\n\u003cli\u003eMade in the UK\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSKU: SSXBM1321\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":58335691833728,"sku":"SSXBM1321","price":3698.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0720\/7557\/5573\/files\/BMW_G8X_M3M4_OPFGPF_Back_with_Centre_Resonator_Bypass_System_with_JET115_Carbon_Fibre_Trims_6a183e8659e2a_0jpeg.jpg?v=1782477650","url":"https:\/\/stringtheorygarage.com\/products\/milltek-sport-bmw-g8x-m3-m4-opf-gpf-back-with-centre-resonator-bypass-system-with-jet-115-carbon-fibre-trims","provider":"String Theory Garage","version":"1.0","type":"link"}