{"product_id":"bmw-f8x-m3-m4-equal-length-valved-sport-exhaust-system","title":"BMW F8x M3 \/ M4 Equal Length Valved Sport Exhaust System","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/iHfweazxIII?si=HU6ckWC6ksmP06wH\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch1\u003e\u003cbr\u003e\u003c\/h1\u003e\n\u003ch1 data-end=\"167\" data-start=\"115\"\u003e\u003cstrong data-end=\"165\" data-start=\"117\"\u003eBMW F8X M3\/M4 Valved Cat-Back Exhaust System\u003c\/strong\u003e\u003c\/h1\u003e\n\u003ch3 data-end=\"235\" data-start=\"168\"\u003eEqual-Length 2.75\" Mid-Section with H-Pipe and 3.5\" Axle-Back\u003c\/h3\u003e\n\u003cp data-end=\"280\" data-start=\"236\"\u003e\u003cem data-end=\"280\" data-start=\"236\"\u003e(T304 Stainless Steel or Grade 5 Titanium)\u003c\/em\u003e\u003c\/p\u003e\n\u003chr data-end=\"285\" data-start=\"282\"\u003e\n\u003ch2 data-end=\"304\" data-start=\"287\"\u003e\u003cstrong data-end=\"302\" data-start=\"290\"\u003eOverview\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp data-end=\"678\" data-start=\"305\"\u003eThe S55 engine powering the BMW F8X M3 and M4 is a performance masterpiece, but its stock exhaust note has long been criticized for excessive rasp and a lack of tonal depth. The \u003cstrong data-end=\"535\" data-start=\"483\"\u003eValvetronic Designs Equal-Length Valved Cat-Back\u003c\/strong\u003e is the definitive solution—eliminating the factory harshness and unlocking the rich, balanced sound the S55 was always capable of producing.\u003c\/p\u003e\n\u003cp data-end=\"1173\" data-start=\"680\"\u003eThis system features a \u003cstrong data-end=\"756\" data-start=\"703\"\u003e2.75-inch equal-length mid-section with an H-pipe\u003c\/strong\u003e feeding into a \u003cstrong data-end=\"794\" data-start=\"772\"\u003e3.5-inch axle-back\u003c\/strong\u003e. The equal-length design smooths the exhaust tone across the rev range while preserving the aggressive character owners love. With valves open, gases exit freely from the passenger-side tips for maximum volume and performance. With valves closed, flow is routed through our quad-chamber muffler to the driver-side tips for a quieter, more refined note—ideal for daily driving.\u003c\/p\u003e\n\u003cp data-end=\"1288\" data-start=\"1175\"\u003eNo cutting or welding is required—this is a true \u003cstrong data-end=\"1249\" data-start=\"1224\"\u003edirect bolt-on system\u003c\/strong\u003e designed to mount to factory points.\u003c\/p\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"3543\" data-start=\"3287\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/AwbRTFOi1mo?si=Xybizcl1n-YVVdUE\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-end=\"1293\" data-start=\"1290\"\u003e\n\u003ch2 data-end=\"1316\" data-start=\"1295\"\u003e\u003cstrong data-end=\"1314\" data-start=\"1298\"\u003eWhy It Works\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-end=\"1583\" data-start=\"1317\"\u003e\n\u003cli data-end=\"1422\" data-start=\"1317\"\u003e\n\u003cp data-end=\"1422\" data-start=\"1319\"\u003e\u003cstrong data-end=\"1348\" data-start=\"1319\"\u003eEqual-Length Mid-Section:\u003c\/strong\u003e Balances pulses for a cleaner, smoother tone without losing aggression.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1499\" data-start=\"1423\"\u003e\n\u003cp data-end=\"1499\" data-start=\"1425\"\u003e\u003cstrong data-end=\"1443\" data-start=\"1425\"\u003eH-Pipe Design:\u003c\/strong\u003e Improves scavenging for a fuller, more refined sound.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1583\" data-start=\"1500\"\u003e\n\u003cp data-end=\"1583\" data-start=\"1502\"\u003e\u003cstrong data-end=\"1526\" data-start=\"1502\"\u003eDual-Mode Operation:\u003c\/strong\u003e Raw and loud (open) or subdued and civilized (closed).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"1588\" data-start=\"1585\"\u003e\n\u003ch2 data-end=\"1614\" data-start=\"1590\"\u003e\u003cstrong data-end=\"1612\" data-start=\"1593\"\u003eSound \u0026amp; Control\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-end=\"1878\" data-start=\"1615\"\u003e\n\u003cli data-end=\"1716\" data-start=\"1615\"\u003e\n\u003cp data-end=\"1716\" data-start=\"1617\"\u003e\u003cstrong data-end=\"1633\" data-start=\"1617\"\u003eValves Open:\u003c\/strong\u003e Aggressive, free-breathing tone with reduced rasp and improved high-rpm clarity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1785\" data-start=\"1717\"\u003e\n\u003cp data-end=\"1785\" data-start=\"1719\"\u003e\u003cstrong data-end=\"1737\" data-start=\"1719\"\u003eValves Closed:\u003c\/strong\u003e Stock-like sound levels for stealthy driving.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1878\" data-start=\"1786\"\u003e\n\u003cp data-end=\"1878\" data-start=\"1788\"\u003e\u003cstrong data-end=\"1817\" data-start=\"1788\"\u003eElectronic Valve Control:\u003c\/strong\u003e Includes standalone controller; OEM integration available.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/LNseyKBqB4c?si=8bZAVMqdlLF_4Szr\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003chr data-end=\"1883\" data-start=\"1880\"\u003e\n\u003ch2 data-end=\"1916\" data-start=\"1885\"\u003e\u003cstrong data-end=\"1914\" data-start=\"1888\"\u003eConstruction \u0026amp; Options\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-end=\"2223\" data-start=\"1917\"\u003e\n\u003cli data-end=\"1981\" data-start=\"1917\"\u003e\n\u003cp data-end=\"1981\" data-start=\"1919\"\u003e\u003cstrong data-end=\"1933\" data-start=\"1919\"\u003eMaterials:\u003c\/strong\u003e T304 stainless steel \u003cstrong data-end=\"1961\" data-start=\"1955\"\u003eor\u003c\/strong\u003e Grade 5 titanium.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2057\" data-start=\"1982\"\u003e\n\u003cp data-end=\"2057\" data-start=\"1984\"\u003e\u003cstrong data-end=\"2003\" data-start=\"1984\"\u003eWeight Savings:\u003c\/strong\u003e –21.7 lb (Stainless) \/ –49.2 lb (Titanium) vs. OEM.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2148\" data-start=\"2058\"\u003e\n\u003cp data-end=\"2148\" data-start=\"2060\"\u003e\u003cstrong data-end=\"2078\" data-start=\"2060\"\u003eCraftsmanship:\u003c\/strong\u003e Precision TIG welds and fully mandrel-bent tubing for maximum flow.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2223\" data-start=\"2149\"\u003e\n\u003cp data-end=\"2223\" data-start=\"2151\"\u003e\u003cstrong data-end=\"2160\" data-start=\"2151\"\u003eTips:\u003c\/strong\u003e Multiple premium finish options to complement your M3 or M4.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2228\" data-start=\"2225\"\u003e\n\u003ch2 data-end=\"2246\" data-start=\"2230\"\u003e\u003cstrong data-end=\"2244\" data-start=\"2233\"\u003eFitment\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-end=\"2357\" data-start=\"2247\"\u003e\n\u003cli data-end=\"2277\" data-start=\"2247\"\u003e\n\u003cp data-end=\"2277\" data-start=\"2249\"\u003e\u003cstrong data-end=\"2275\" data-start=\"2249\"\u003e2015–2018 BMW M3 (F80)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2314\" data-start=\"2278\"\u003e\n\u003cp data-end=\"2314\" data-start=\"2280\"\u003e\u003cstrong data-end=\"2312\" data-start=\"2280\"\u003e2015–2020 BMW M4 Coupe (F82)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2357\" data-start=\"2315\"\u003e\n\u003cp data-end=\"2357\" data-start=\"2317\"\u003e\u003cstrong data-end=\"2355\" data-start=\"2317\"\u003e2015–2020 BMW M4 Convertible (F83)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/M30lYzI0Tq0?si=_imNM4v17q0a5Qvi\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003chr data-end=\"2362\" data-start=\"2359\"\u003e\n\u003ch2 data-end=\"2391\" data-start=\"2364\"\u003e\u003cstrong data-end=\"2389\" data-start=\"2367\"\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-end=\"2683\" data-start=\"2392\"\u003e\n\u003cli data-end=\"2443\" data-start=\"2392\"\u003e\n\u003cp data-end=\"2443\" data-start=\"2394\"\u003eDirect bolt-on; no cutting or welding required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2492\" data-start=\"2444\"\u003e\n\u003cp data-end=\"2492\" data-start=\"2446\"\u003e100% reversible—return to stock at any time.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2683\" data-start=\"2493\"\u003e\n\u003cp data-end=\"2683\" data-start=\"2495\"\u003e\u003cem data-end=\"2517\" data-start=\"2495\"\u003eNote for S55 Owners:\u003c\/em\u003e On free-flow\/race downpipes, “2k rpm rasp” may be present during low-rpm shifts. For the most refined tone, we recommend high-flow (200 cell) catalytic converters.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"2688\" data-start=\"2685\"\u003e\n\u003ch2 data-end=\"2714\" data-start=\"2690\"\u003e\u003cstrong data-end=\"2712\" data-start=\"2693\"\u003eWhat’s Included\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-end=\"2910\" data-start=\"2715\"\u003e\n\u003cli data-end=\"2756\" data-start=\"2715\"\u003e\n\u003cp data-end=\"2756\" data-start=\"2717\"\u003e2.75\" equal-length H-pipe mid-section\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2801\" data-start=\"2757\"\u003e\n\u003cp data-end=\"2801\" data-start=\"2759\"\u003e3.5\" axle-back with quad-chamber muffler\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2872\" data-start=\"2802\"\u003e\n\u003cp data-end=\"2872\" data-start=\"2804\"\u003eElectronic valve system with controller (OEM integration optional)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2910\" data-start=\"2873\"\u003e\n\u003cp data-end=\"2910\" data-start=\"2875\"\u003eAll necessary clamps and hardware\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/VaFdvNKLGPQ?si=ERfWObTWAAbISIWX\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003chr data-end=\"2915\" data-start=\"2912\"\u003e\n\u003ch2 data-end=\"2940\" data-start=\"2917\"\u003e\u003cstrong data-end=\"2938\" data-start=\"2920\"\u003eSpecifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-end=\"3280\" data-start=\"2941\"\u003e\n\u003cli data-end=\"3001\" data-start=\"2941\"\u003e\n\u003cp data-end=\"3001\" data-start=\"2943\"\u003e\u003cstrong data-end=\"2968\" data-start=\"2943\"\u003eMid-Section Diameter:\u003c\/strong\u003e 2.75\" equal-length with H-pipe\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3034\" data-start=\"3002\"\u003e\n\u003cp data-end=\"3034\" data-start=\"3004\"\u003e\u003cstrong data-end=\"3027\" data-start=\"3004\"\u003eAxle-Back Diameter:\u003c\/strong\u003e 3.5\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3093\" data-start=\"3035\"\u003e\n\u003cp data-end=\"3093\" data-start=\"3037\"\u003e\u003cstrong data-end=\"3050\" data-start=\"3037\"\u003eMaterial:\u003c\/strong\u003e T304 stainless steel or Grade 5 titanium\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3138\" data-start=\"3094\"\u003e\n\u003cp data-end=\"3138\" data-start=\"3096\"\u003e\u003cstrong data-end=\"3107\" data-start=\"3096\"\u003eValves:\u003c\/strong\u003e Electronic, rapid open\/close\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3213\" data-start=\"3139\"\u003e\n\u003cp data-end=\"3213\" data-start=\"3141\"\u003e\u003cstrong data-end=\"3160\" data-start=\"3141\"\u003eWeight Savings:\u003c\/strong\u003e –21.7 lb (Stainless) \/ –49.2 lb (Titanium) vs. OEM\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3280\" data-start=\"3214\"\u003e\n\u003cp data-end=\"3280\" data-start=\"3216\"\u003e\u003cstrong data-end=\"3227\" data-start=\"3216\"\u003eDesign:\u003c\/strong\u003e Quad-chamber muffler for refined closed-valve tone\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"3285\" data-start=\"3282\"\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Valvetronic Designs","offers":[{"title":"Stainless Steel \/ (4) Brushed Steel (3.5\" Outlet) \/ Full Exhaust","offer_id":54050009284883,"sku":"BMW.F8X.M3.M4.VSES.BR.BRSH","price":2999.99,"currency_code":"USD","in_stock":true},{"title":"Stainless Steel \/ (4) Brushed Steel (3.5\" Outlet) \/ + 400 Cell Catted Downpipes","offer_id":54050009317651,"sku":"BMW.F8X.M3.M4.VSES.400C.BR.BRSH","price":4999.99,"currency_code":"USD","in_stock":true},{"title":"Stainless Steel \/ (4) Burnt (3.5\" Outlet) \/ Full 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