{"product_id":"milltek-cat-back-exhaust-bmw-5-series-m5-comp-4-4-twin-turbo-f90-lci-opf-gpf-21","title":"Milltek Cat Back Exhaust BMW 5 Series M5 Comp 4.4 Twin Turbo F90 LCI OPF\/GPF 21+","description":"\u003ch2\u003eMilltek Cat-back Exhaust for BMW 5 Series M5 \u0026amp; M5 Competition 4.4l Twin Turbo F90 LCI (OPF\/GPF Equipped Cars) (2021 onwards) – Sharper Sound, Reduced Back Pressure\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's cat-back system for the BMW 5 Series M5 \u0026amp; M5 Competition 4.4l Twin Turbo F90 LCI (OPF\/GPF Equipped Cars). It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard. It's offered in 5 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: check the notes on each version below, as some need supporting software.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Cat-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 80mm (3.15\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitting Time:\u003c\/strong\u003e approx. 3 to 4 hours (Milltek figure)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMade from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration\u003c\/li\u003e\n\u003cli\u003eMandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow\u003c\/li\u003e\n\u003cli\u003e80mm (3.15\") pipework\u003c\/li\u003e\n\u003cli\u003eReplaces the standard exhaust from the catalytic converter back, so the factory cat is retained\u003c\/li\u003e\n\u003cli\u003eChoice of 5 tailpipe finishes: GT-100 Brushed Titanium, GT-100 Burnt Titanium, JET-100 Carbon Fibre, GT-100 Cerakote Black, GT-100 Polished\u003c\/li\u003e\n\u003cli\u003eDesigned, developed and manufactured in the UK by Milltek Sport\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\u003cli\u003eBMW 5 Series M5 \u0026amp; M5 Competition 4.4l Twin Turbo F90 LCI (OPF\/GPF Equipped Cars) (2021 onwards)\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the BMW 5 Series M5 \u0026amp; M5 Competition 4.4l Twin Turbo F90 (OPF\/GPF Equipped Cars), which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-bmw-5-series-m5-comp-4-4-twin-turbo-f90-opf-gpf-20-21\"\u003eMilltek Cat-back Exhaust BMW 5 Series M5 \u0026amp; M5 Comp 4.4l Twin Turbo F90 OPF\/GPF 20-21\u003c\/a\u003e; the BMW 5 Series M5 Saloon M TwinPower Turbo V8 (F10), which needs the \u003ca href=\"\/products\/milltek-cat-back-exhaust-bmw-5-series-m5-saloon-m-twinpower-turbo-v8-f10-11-16\"\u003eMilltek Cat-back Exhaust BMW 5 Series M5 Saloon M TwinPower Turbo V8 F10 11-16\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes a fitting time of approx. 3 to 4 hours. Some versions: Cat Back System inc. OPF\/GPF Bypass with Brushed Titanium GT-100 Trims - Required Stage 2 ECU Software or OPF\/GPF Bypass Module - For Vehicles with Flange Connection to OE Downpipes. Some versions: Cat Back System inc. OPF\/GPF Bypass with Burnt\/Blue Titanium GT-100 Trims - Required Stage 2 ECU Software or OPF\/GPF Bypass Module - For Vehicles with Flange Connection to OE Downpipes. Some versions: Cat Back System inc. OPF\/GPF Bypass with Carbon JET-100 Trims - Required Stage 2 ECU Software or OPF\/GPF Bypass Module - For Vehicles with Flange Connection to OE Downpipes. Some versions: Cat Back System inc. OPF\/GPF Bypass with Cerakote Black GT-100 Trims - Required Stage 2 ECU Software or OPF\/GPF Bypass Module - For Vehicles with Flange Connection to OE Downpipes. We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.\u003c\/p\u003e\n\u003ch3\u003eUpgrade Further\u003c\/h3\u003e\n\u003cp\u003eAlso available from Milltek for this car: \u003ca href=\"\/products\/milltek-gpf-opf-bypass-bmw-5-series-m5-comp-4-4-twin-turbo-f90-lci-opf-gpf-21\"\u003eMilltek GPF\/OPF Bypass BMW 5 Series M5 \u0026amp; M5 Comp 4.4l Twin Turbo F90 LCI OPF\/GPF 21+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: GT-100 Brushed Titanium, GT-100 Burnt Titanium, JET-100 Carbon Fibre, GT-100 Cerakote Black, GT-100 Polished. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the BMW 5 Series M5 \u0026amp; M5 Competition 4.4l Twin Turbo F90 (OPF\/GPF Equipped Cars)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-cat-back-exhaust-bmw-5-series-m5-comp-4-4-twin-turbo-f90-opf-gpf-20-21\"\u003eMilltek Cat-back Exhaust BMW 5 Series M5 \u0026amp; M5 Comp 4.4l Twin Turbo F90 OPF\/GPF 20-21\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eMilltek lists this as a race part without EC approval, so it is intended for off-road and competition use.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eSome versions do. Milltek notes: \"Cat Back System inc. OPF\/GPF Bypass with Brushed Titanium GT-100 Trims - Required Stage 2 ECU Software or OPF\/GPF Bypass Module - For Vehicles with Flange Connection to OE Downpipes\". Check the notes for the version you choose.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory catalytic converter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory catalytic converter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eMilltek quotes approx. 3 to 4 hours.\u003c\/p\u003e\n\u003ch3\u003eWhat is it made from?\u003c\/h3\u003e\n\u003cp\u003eT304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.\u003c\/p\u003e\n\u003ch3\u003eIs there a warranty?\u003c\/h3\u003e\n\u003cp\u003eYes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.\u003c\/p\u003e","brand":"Milltek","offers":[{"title":"GT-100 Brushed Titanium","offer_id":56392783102337,"sku":"MIL-SSXBM1229","price":4419.88,"currency_code":"GBP","in_stock":true},{"title":"GT-100 Burnt Titanium","offer_id":56392783135105,"sku":"MIL-SSXBM1230","price":4736.14,"currency_code":"GBP","in_stock":true},{"title":"JET-100 Carbon Fibre","offer_id":56392783167873,"sku":"MIL-SSXBM1231","price":4367.96,"currency_code":"GBP","in_stock":true},{"title":"GT-100 Cerakote Black","offer_id":56392783200641,"sku":"MIL-SSXBM1228","price":4113.58,"currency_code":"GBP","in_stock":true},{"title":"GT-100 Polished","offer_id":56392783233409,"sku":"MIL-SSXBM1227","price":4113.63,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXBM1229_1.jpg?v=1791892439","url":"https:\/\/milltekexhaustshop.com\/products\/milltek-cat-back-exhaust-bmw-5-series-m5-comp-4-4-twin-turbo-f90-lci-opf-gpf-21","provider":"Milltek Exhaust Shop","version":"1.0","type":"link"}