{"product_id":"grail-abgasanlage-3-5-zoll-passend-f-r-bmw-m4-f82","title":"GRAIL exhaust suitable for BMW M4 F82 \/ F83 without OPF (S55) – valved exhaust 3.5-inch","description":"\u003ch1\u003eGrail exhaust system 3.5 inch suitable for BMW M4 F82 \/ F83 without OPF (S55) – Valve system\u003c\/h1\u003e\n\n\u003ch2\u003eThe most uncompromising system for the S55 – 3.5 inches, without OPF, brutally loud\u003c\/h2\u003e\n\u003cp\u003eIf the 3-inch system is right for your MWhile the 4 was already a step above the standard, the 3.5-inch GRAIL is on another level entirely. Specifically designed for M4 F82 Coupé and F83 Cabriolet without gasoline particulate filters, designed for maximum exhaust flow and uncompromising sound. This system extracts the maximum power from the S55 biturbo out, what BMW M who had technical confidence in him – without filters, without restraint, with the full presence of an inline six-cylinder engine.\u003c\/p\u003e\n\u003cp\u003eAnd the best part: despite its brutal sound, the system remains fully legal and registration-free within the EU thanks to ECE type approval. Ready to drive immediately after installation, no TÜV appointment, no registration bureaucracy.\u003c\/p\u003e\n\u003cp\u003eHandmade in Germany, entirely from L304 stainless steel. The premium choice for M4-drivers with a non-OPF setup who want uncompromising sound characteristics or who want to future-proof their system for stage tuning.\u003c\/p\u003e\n\n\u003ch2\u003eWhy 3.5 inches – and who would benefit from it?\u003c\/h2\u003e\n\u003cp\u003e3.5 inches is not a standard diameter, but a deliberate premium choice. The larger cross-section offers:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMore sound:\u003c\/strong\u003e More voluminous, clearer, with more bass punch. This system is uncompromisingly loud – truly furious in Sport mode, yet still discreet in Cruise mode thanks to the factory-installed valve control.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum throughput:\u003c\/strong\u003e Especially important for performance-enhanced S55 setups (Stage 2 \/ Stage 3). With software tuning, a larger downpipe, or methanol injection, the standard 3-inch system will eventually become a bottleneck – the 3.5-inch system will not.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo OPF in the way:\u003c\/strong\u003e Without the factory-installed particulate filter, the exhaust gas flows through the system unobstructed. The result: an even clearer sound and even less back pressure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eEqual Length or Standard Piping\u003c\/h2\u003e\n\u003cp\u003eAs with the 3-inch version, you also have a choice of piping here:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard piping:\u003c\/strong\u003e Asymmetrical pipe routing, direct and compact design\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEqual Length Piping:\u003c\/strong\u003e Both banks are guided by pipes of exactly the same length – for more homogeneous exhaust gas pulsation, a more harmonious sound signature and more even flow behavior.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEspecially in combination with 3.5 inches and non-OPF, Equal Length is the top class for S55-tuners who place maximum value on sound characteristics and consistency.\u003c\/p\u003e\n\n\u003ch2\u003eFlap control – factory-installed\u003c\/h2\u003e\n\u003cp\u003eThe MThe F82\/F83 has its own exhaust flap control system from the factory – the GRAIL system takes over this completely. Plug-and-play, no wiring, no remote control in the interior.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIn the M-Sport mode opens the flaps fully – full, brutal GRAIL sound\u003c\/li\u003e\n  \u003cli\u003eIn Comfort mode they remain closed – the system complies with ECE standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eConfiguration in the configurator\u003c\/h2\u003e\n\u003cp\u003eBefore ordering, you select the following factors:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiping:\u003c\/strong\u003e Standard or Equal Length\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTailpipe color:\u003c\/strong\u003e brushed stainless steel or black\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUnsure about the configuration or non-OPF status of your M4? Send us the VIN via WhatsApp or contact form – we'll check it for you.\u003c\/p\u003e\n\n\u003ch2\u003eTailpipes – 4x 100 mm round\u003c\/h2\u003e\n\u003cp\u003eThe system comes with the classic M-4-pipe look: four round 100 mm tailpipes. This keeps the appearance close to the OEM look.M-Look of the F82 \/ F83 and harmonizes perfectly with factory or aftermarket diffuser.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrushed stainless steel:\u003c\/strong\u003e Sporty and elegant, high-quality look at the rear\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlack:\u003c\/strong\u003e A subtle yet aggressive look – goes well with the black package and dark rims.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eMaterial \u0026 workmanship\u003c\/h2\u003e\n\u003cp\u003eLMade entirely of 304 stainless steel, with CNC-precision machined components. The silencers were specially developed in the GRAIL sound lab for the 3.5-inch non-OPF variant – focusing on maximum sound without compromising tone. Flow-optimized pipe routing minimizes exhaust backpressure, and the solid stainless steel valves switch precisely and reliably for everyday use.\u003c\/p\u003e\n\n\u003ch2\u003eHighlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSpecifically designed for BMW M4 F82 \/ F83 without OPF\u003c\/li\u003e\n  \u003cli\u003e3.5 inches – maximum throughput for non-OPF and stage setups\u003c\/li\u003e\n  \u003cli\u003eECE type approval – registration-free despite uncompromising volume\u003c\/li\u003e\n  \u003cli\u003eChoice between standard or equal length piping\u003c\/li\u003e\n  \u003cli\u003eL304 stainless steel, handcrafted in Germany\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eOrder with installation from FLOW DOWN®\u003c\/h2\u003e\n\u003cp\u003eFLOW DOWN® is an official GRAIL partner in the Ruhr area. When you order with installation, you'll receive our fair deposit payment model:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e50% deposit upon order placement – we will then order the system from GRAIL\u003c\/li\u003e\n  \u003cli\u003eAs soon as the system arrives at our workshop, we will arrange an installation date with you.\u003c\/li\u003e\n  \u003cli\u003eYou only pay the remaining amount after the installation has been completed – not before.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e The deposit payment option applies exclusively to bookings including installation and is only available via prepayment\/bank transfer. PayPal or other payment methods are not accepted for this service.\u003c\/p\u003e\n\n\u003ch2\u003eSwiss suitability assessment\u003c\/h2\u003e\n\u003cp\u003eUpon request, you can receive a Swiss suitability assessment for the GRAIL system for an additional fee. If interested, simply contact support.\u003c\/p\u003e\n\n\u003ch2\u003eSuitable vehicles\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eBMW M4 F82 Coupé without OPF\u003c\/li\u003e\n  \u003cli\u003eBMW M4 F83 Cabrio without OPF\u003c\/li\u003e\n  \u003cli\u003eBMW M4 Competition F82 \/ F83 without OPF\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNote: This 3.5-inch system is exclusively for M4 models designed without a gasoline particulate filter. For MFor 4 with OPF, the shop offers a dedicated GRAIL exhaust system in 3 inches (with and without OPF versions). Not suitable for: M3 F80 (own system), M3 G80 \/ M4 G82 \/ G83 (S58, own facilities).\u003c\/p\u003e\n\n\u003ch2\u003escope of delivery\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eGRAIL 3.5 inch flap exhaust system suitable for BMW M4 F82 \/ F83 without OPF (in your chosen variant)\u003c\/li\u003e\n  \u003cli\u003e4x 100 mm round tailpipes in brushed stainless steel or black (depending on selection)\u003c\/li\u003e\n  \u003cli\u003emounting material\u003c\/li\u003e\n  \u003cli\u003eECE type approval as proof for the vehicle\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInformation on admission\u003c\/h2\u003e\n\u003cp\u003eRegistration-free thanks to ECE type approval – despite its uncompromising volume, the system is fully legal within the EU with standard approval. For imported vehicles with different operating permits, please check registration requirements before ordering.\u003c\/p\u003e","brand":"Grail","offers":[{"title":"stainless steel \/ Without OPF \/ Equal Length Option","offer_id":58009054871816,"sku":null,"price":3649.0,"currency_code":"EUR","in_stock":true},{"title":"stainless steel \/ Without OPF \/ Standard piping","offer_id":58009054904584,"sku":null,"price":3649.0,"currency_code":"EUR","in_stock":true},{"title":"black \/ Without OPF \/ Equal Length Option","offer_id":58009055002888,"sku":null,"price":3849.0,"currency_code":"EUR","in_stock":true},{"title":"black \/ Without OPF \/ Standard piping","offer_id":58009055035656,"sku":null,"price":3649.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/4582\/0493\/files\/GRAIL_FLOWDOWN.jpg?v=1749416680","url":"https:\/\/flow-down.com\/en\/products\/grail-exhaust-system-3-5-inch-suitable-for-bmw-m4-f82","provider":"FLOW DOWN®","version":"1.0","type":"link"}