{"product_id":"milltek-filter-back-exhaust-bmw-1-series-m135i-xdrive-5dr-f40-opf-gpf-19","title":"Milltek Filter Back Exhaust BMW 1 Series M135i xDrive 5dr F40 OPF\/GPF 19+","description":"\u003ch2\u003eMilltek Filter-back Exhaust for BMW 1 Series M135i xDrive 5 Door (F40 OPF\/GPF Equipped) (2019 onwards) – Sharper Sound, Filter Retained\u003c\/h2\u003e\n\u003cp\u003eThis is Milltek's particulate filter-back system for the BMW 1 Series M135i xDrive 5 Door (F40 OPF\/GPF Equipped). It replaces everything downstream of the factory diesel or petrol particulate filter with wider-bore pipework and re-tuned silencers, cutting back pressure and sharpening the exhaust note. The filter itself is left exactly where the manufacturer fitted it, so emissions equipment is unaffected. It's offered in 9 tailpipe finishes, so you can pick the setup that suits how the car's used.\u003c\/p\u003e\n\u003cp\u003eIt's the right choice if you want a sportier sound and a genuine, if modest, flow improvement on a filter-equipped car, without going anywhere near the parts of the system that keep it emissions-compliant.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Type:\u003c\/strong\u003e Particulate Filter-back\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 76.2mm (3\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC Approved:\u003c\/strong\u003e Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRace System:\u003c\/strong\u003e No\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\u003e76.2mm (3\") pipework\u003c\/li\u003e\n\u003cli\u003eFits behind the factory particulate filter, which stays in place\u003c\/li\u003e\n\u003cli\u003eChoice of 9 tailpipe finishes: GT-100 Brushed Titanium, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium and more\u003c\/li\u003e\n\u003cli\u003eEC approved\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 1 Series M135i xDrive 5 Door (F40 OPF\/GPF Equipped) (2019 onwards)\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNot suitable for:\u003c\/strong\u003e the BMW 1 Series M135i xDrive 5 Door (F70 OPF\/GPF Equipped), which needs the \u003ca href=\"\/products\/milltek-filter-back-exhaust-bmw-1-series-m135i-xdrive-5dr-f70-opf-gpf-24\"\u003eMilltek Filter-back Exhaust BMW 1 Series M135i xDrive 5dr F70 OPF\/GPF 24+\u003c\/a\u003e; the BMW 1 Series 128ti 5 Door (F40 OPF\/GPF Equipped), which needs the \u003ca href=\"\/products\/milltek-filter-back-exhaust-bmw-1-series-128ti-5dr-f40-opf-gpf-21\"\u003eMilltek Filter-back Exhaust BMW 1 Series 128ti 5dr F40 OPF\/GPF 21+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eInstallation\u003c\/h3\u003e\n\u003cp\u003eThe fitting time varies by version; see the specification table for the option you choose. Some versions: Maxton x Milltek - OPF\/GPF Back System with Quad GT-100 Brushed Titanium Trims - ECE Approved (OE System Requires To Be Cut For Installation) - MUST BE Fitted with Maxton Diffuser. Some versions: Maxton x Milltek - OPF\/GPF Back System with Quad GT-100 Burnt\/Blue Titanium Trims - ECE Approved (OE System Requires To Be Cut For Installation) - MUST BE Fitted with Maxton Diffuser. Some versions: Maxton x Milltek - OPF\/GPF Back System with Quad GT-100 Cerakote Black Trims - ECE Approved (OE System Requires To Be Cut For Installation) - MUST BE Fitted with Maxton Diffuser. Some versions: Maxton x Milltek - OPF\/GPF Back System with Quad GT-100 Polished Trims - ECE Approved (OE System Requires To Be Cut For Installation) - MUST BE Fitted with Maxton Diffuser. 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\u003eWhich tailpipe finishes are available?\u003c\/h3\u003e\n\u003cp\u003eYou can choose from: GT-100 Brushed Titanium, GT-100 Burnt Titanium, GT-100 Cerakote Black, GT-100 Polished, GT-115 Burnt Titanium, GT-115 Cerakote Black, GT-115 Polished, GT-115 Titanium, JET-115 Carbon Fibre. The finish is cosmetic and does not change the sound.\u003c\/p\u003e\n\u003ch3\u003eDoes it fit the BMW 1 Series M135i xDrive 5 Door (F70 OPF\/GPF Equipped)?\u003c\/h3\u003e\n\u003cp\u003eNo. For that car, choose the \u003ca href=\"\/products\/milltek-filter-back-exhaust-bmw-1-series-m135i-xdrive-5dr-f70-opf-gpf-24\"\u003eMilltek Filter-back Exhaust BMW 1 Series M135i xDrive 5dr F70 OPF\/GPF 24+\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs it road legal?\u003c\/h3\u003e\n\u003cp\u003eEvery version of this part is listed by Milltek as EC approved.\u003c\/p\u003e\n\u003ch3\u003eDo I need a remap?\u003c\/h3\u003e\n\u003cp\u003eNo. It fits behind the factory particulate filter, so no software changes are needed.\u003c\/p\u003e\n\u003ch3\u003eDoes it keep the factory particulate filter?\u003c\/h3\u003e\n\u003cp\u003eYes. It fits behind the factory particulate filter, which stays in place.\u003c\/p\u003e\n\u003ch3\u003eHow long does it take to fit?\u003c\/h3\u003e\n\u003cp\u003eIt depends on the version. Milltek's fitting time for each option is shown in its specification table.\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":56392760197505,"sku":"MIL-SSXBM1246","price":2013.52,"currency_code":"GBP","in_stock":true},{"title":"GT-100 Burnt Titanium","offer_id":56392760230273,"sku":"MIL-SSXBM1247","price":2103.34,"currency_code":"GBP","in_stock":true},{"title":"GT-100 Cerakote Black","offer_id":56392760263041,"sku":"MIL-SSXBM1245","price":1645.36,"currency_code":"GBP","in_stock":true},{"title":"GT-100 Polished","offer_id":56392760295809,"sku":"MIL-SSXBM1244","price":1523.83,"currency_code":"GBP","in_stock":true},{"title":"GT-115 Burnt Titanium","offer_id":56392760328577,"sku":"MIL-SSXBM1155","price":1461.15,"currency_code":"GBP","in_stock":true},{"title":"GT-115 Cerakote Black","offer_id":56392760361345,"sku":"MIL-SSXBM1153","price":1278.29,"currency_code":"GBP","in_stock":true},{"title":"GT-115 Polished","offer_id":56392760394113,"sku":"MIL-SSXBM1152","price":1133.52,"currency_code":"GBP","in_stock":true},{"title":"GT-115 Titanium","offer_id":56392760426881,"sku":"MIL-SSXBM1154","price":1398.0,"currency_code":"GBP","in_stock":true},{"title":"JET-115 Carbon Fibre","offer_id":56392760459649,"sku":"MIL-SSXBM1156","price":1427.43,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0667\/3232\/7161\/files\/SSXBM1246_1.jpg?v=1791891951","url":"https:\/\/milltekexhaustshop.com\/products\/milltek-filter-back-exhaust-bmw-1-series-m135i-xdrive-5dr-f40-opf-gpf-19","provider":"Milltek Exhaust Shop","version":"1.0","type":"link"}