{"product_id":"bmw-f90-m5-f91-f92-f93-m8-s63-catless-downpipes-2017-2021","title":"BMW F90 M5 \/ F91 F92 F93 M8 S63 Catless Downpipes (2017–2021)","description":"\u003ch2\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBMW F90 M5 \/ F91 F92 F93 M8 S63 Catless Downpipes (2017–2021)\u003c\/b\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eMaximum Exhaust Flow. Enhanced Twin-Turbo Response. Unleash V8 Performance.\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eUnlock the performance potential of your BMW M vehicle with the \u003cspan class=\"s1\"\u003e\u003cb\u003eSimuFlow Catless Downpipes\u003c\/b\u003e\u003c\/span\u003e, engineered for compatible BMW F90 M5 and F91\/F92\/F93 M8 models equipped with the powerful 4.4L S63 twin-turbocharged V8 engine.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eDesigned to eliminate the restrictions of the factory catalytic converters, these high-performance downpipes provide a more direct exhaust path, helping reduce backpressure, improve turbocharger efficiency, and deliver a louder, more aggressive exhaust note.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eWhether you’re building a high-horsepower S63 setup or preparing your BMW for dedicated track use, the SimuFlow Catless Downpipes are designed to support increased exhaust flow and demanding performance applications.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eKey Features\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eHigh-Flow Catless Design:\u003c\/b\u003e\u003c\/span\u003e Eliminates the factory catalytic converters to reduce exhaust restriction and maximize exhaust flow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eTwin-Turbo V8 Performance:\u003c\/b\u003e\u003c\/span\u003e Designed to support the increased exhaust demands of BMW’s 4.4L S63 twin-turbocharged engine.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eEnhanced Turbo Response:\u003c\/b\u003e\u003c\/span\u003e Reduced exhaust backpressure can support quicker turbo spool and sharper throttle response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eOptimized Exhaust Efficiency:\u003c\/b\u003e\u003c\/span\u003e Promotes improved exhaust gas evacuation, particularly under increased boost pressure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eAggressive Exhaust Sound:\u003c\/b\u003e\u003c\/span\u003e Produces a louder, deeper exhaust note with enhanced turbocharger sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003ePerformance Tuning Potential:\u003c\/b\u003e\u003c\/span\u003e Designed to complement performance ECU calibrations and supporting engine modifications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eS63 Platform Compatibility:\u003c\/b\u003e\u003c\/span\u003e Designed for compatible BMW F90 M5 and F91\/F92\/F93 M8 applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003ePerformance Benefits\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eMaximum Exhaust Flow\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThe catless design removes the factory catalytic converter restrictions, allowing exhaust gases to exit the twin turbochargers more efficiently. This helps reduce backpressure and supports improved performance under demanding conditions.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eEnhanced Twin-Turbo Efficiency\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eReducing exhaust restriction can help the S63’s twin turbochargers operate more efficiently, particularly on modified vehicles running increased boost pressure.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eAggressive S63 V8 Exhaust Note\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eExperience a louder, deeper, and more pronounced exhaust tone with enhanced turbocharger sound, bringing out the distinctive character of BMW’s high-performance twin-turbocharged V8 engine.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eVehicle Compatibility\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBMW M5:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e F90 — 2018–2021\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBMW M8 Convertible:\u003c\/b\u003e\u003c\/span\u003e F91 — 2020–2021 (market-dependent)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBMW M8 Coupe:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e F92 — 2020–2021\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBMW M8 Gran Coupe:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e F93 — 2020–2021\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eEngine:\u003c\/b\u003e\u003c\/span\u003e 4.4L S63 Twin-Turbocharged V8\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eConfiguration:\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e Catless Downpipes\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003e\u003cb\u003eNote:\u003c\/b\u003e Fitment may vary by production year, chassis configuration, and emissions equipment. Confirm compatibility before purchasing.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eImportant Information\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eFor competition\/off-road use only where legally permitted.\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eThese downpipes remove the factory catalytic converters and are not legal for use on pollution-controlled vehicles on public roads in the United States.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended.\u003c\/li\u003e\n\u003cli\u003eInstallation may trigger a check engine light.\u003c\/li\u003e\n\u003cli\u003eECU calibration may be required depending on the vehicle’s configuration.\u003c\/li\u003e\n\u003cli\u003eVerify exact vehicle compatibility before purchasing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eShipping \u0026amp; Delivery\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eEstimated Delivery Time: 15 Days\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eYour SimuFlow High-Flow Catted Downpipe is carefully prepared and shipped to ensure it arrives safely and in excellent condition.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003ePlease allow approximately \u003cspan class=\"s1\"\u003e\u003cb\u003e15 days for delivery\u003c\/b\u003e\u003c\/span\u003e from the date your order is placed. Delivery times may vary slightly depending on your location and shipping conditions.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":47599635398828,"sku":null,"price":425.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/1475\/0636\/files\/IMG_5669.png?v=1791606174","url":"https:\/\/simuflowexhaustco.com\/products\/bmw-f90-m5-f91-f92-f93-m8-s63-catless-downpipes-2017-2021","provider":"My Store","version":"1.0","type":"link"}