{"product_id":"hkstudie-catback-exhaust-2021-2025-bmw-m3-m4","title":"HKStudie Catback Exhaust 2021-2025 BMW M3\/M4","description":"\u003cp class=\"is-style-balloon_box\"\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003e\u003cstrong\u003eA one-of-a-kind tail tip design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eA specially designed tail tips paid homage to the legendary “BMW 3.0 CSL“. It has a thick-walled slash-cut tail tips, emphasizing the texture of the edges, and the surface is blasted to express a dull glossy finish. Features a sound deadening inner slits to create a one-of-a-kind tail tip design.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003eGentle yet powerful sound\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe OEM exhaust of the G8X generation M produces a sporty sound that is distinctive of the M series. Since replacing only the main muffler does not produce a significant change in sound, the HKSTUDIE exhaust features a layout that deletes the middle muffler. The unique sound tuning based on frequency analysis has achieved gentle yet powerful sound.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003eCompliant with Japan’s vehicle inspection regulations\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAlthough it gives off a powerful sound, it still meets the strict sound regulation of UN ECE-R51.03 Phase 2. This products can be used safely for daily use and is compliant with Japan’s vehicle inspection regulations.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003eReduce exhaust pressure by up to 35％\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOptimized pipe layout and a main muffler without restrictions reduce exhaust pressure by up to 35% compared to the OEM muffler. This results in increased boost responsiveness and higher output at high RPM range, and increases power output by up to 5kw and torque by up to 15Nm.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003e35% reduction in exhaust resistance (max.)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBy optimizing the layout, adopting a straight pipe without squeezing and the internal structure of the main muffler without restrictions, exhaust resistance is significantly reduced compared to the OEM exhaust as shown in the graph below as a result of in-house testing.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003eIncreases output ＋5kw and torque +15Nm\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLowering exhaust pressure leads to higher engine power output. As shown in the figure below, the response of the turbo boost is improved in the low rpm range, and torque is increased by up to 15Nm. As for power output, the better exhaust flow leads to more power at higher engine speeds, increasing the power by up to 5kw. All tests at our headquarters were conducted using vehicles in stock condition except for the exhaust system. The difference in power output between OEM and HKSTUDIE exhaust systems will widen further when the ECU is analyzed and tuned to increase power output.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003eExhaust sound tuning based on frequency analysis\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eGenerally, low-frequency noise below 100 Hz are said to be unpleasant and oppressive, and are described as drone sounds in the cabin of a car. HKSTUDIE produced various prototype exhausts and conducted sound frequency analysis.\u003c\/p\u003e\n\u003cp\u003eGeneral exhaust with internally constructed mufflers will have a marked drone sound (see the graph below around 100 Hz), while the OEM exhaust successfully muffles the low-frequency sound.\u003c\/p\u003e\n\u003cp\u003eThis drone sound is especially noticeable when cruising at 80 to 100 km\/h on highways. HKSTUDIE exhaust has newly designed the inside of the muffler silencer to suppress the muffled sound and to emphasize the mid-frequency sound above 200Hz, which is considered to be a sporty sound.\u003c\/p\u003e\n\u003cp\u003eThanks to its gentle sound during cruising, the driver and passengers will not feel any discomfort, and once the driver steps on the gas pedal, they will enjoy the powerful sound.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003eExhaust Sound Level\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn-house measurements of UN-ECE R51, a rough guide to the volume of an exhaust system, are shown below. It is a comparison of three different types of mufflers: a stock exhaust, a prototype of a general muffler, and an HKSTUDIE exhaust.\u003c\/p\u003e\n\u003cp class=\"is-style-balloon_box\"\u003e\u003cstrong\u003e\u003cspan class=\"swl-fz u-fz-l\"\u003eA 2-year or 30,000 km product warranty\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBy manufacturing in-house at our factory in Japan and conducting strict quality control, we are able to offer a 2-year or 30,000 km product warranty from the time of purchase.\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003ctable class=\"has-fixed-layout\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertification Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJARI10240006P\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMain Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSUS304\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTail Tips Outer Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e101.6mm (Quad Exit Style)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMain Pipe Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e70mm x2⇒60.5mm x2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSound Level (OEM)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e94dB (Idle: 63dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSound Level (HKSTUDIE)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e97dB (Idle: 64dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMinimum Ground Clearance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e135mm (#2 Mid Pipe)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"HKS","offers":[{"title":"Default Title","offer_id":45673856106671,"sku":"HKSTUDIE-EX001","price":5500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/3598\/4815\/files\/hkstudie-catback-exhaust-2021-2025-bmw-m3m4-hkstudie-ex001-4615263.jpg?v=1753947689","url":"https:\/\/subimods.com\/products\/hkstudie-catback-exhaust-2021-2025-bmw-m3-m4","provider":"Subimods.com","version":"1.0","type":"link"}