{"product_id":"valvetronic-designs-bmw-m3-m4-valved-exhaust","title":"Valvetronic Designs BMW F80\/F82\/F83 M3\/M4 Equal Length Valved Sport Exhaust System","description":"\u003cp\u003eBMW F8X M3\/M4 Valved Cat-Back Exhaust System\u003c\/p\u003e\u003cp\u003eEqual-Length 2.75\" Mid-Section with H-Pipe and 3.5\" Axle-Back\u003c\/p\u003e\u003cp\u003e(T304 Stainless Steel or Grade 5 Titanium)\u003c\/p\u003e\u003cp\u003eOverview\u003c\/p\u003e\u003cp\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 Valvetronic Designs Equal-Length Valved Cat-Back is the definitive solution—eliminating the factory harshness and unlocking the rich, balanced sound the S55 was always capable of producing.\u003c\/p\u003e\u003cp\u003eThis system features a 2.75-inch equal-length mid-section with an H-pipe feeding into a 3.5-inch axle-back. 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\u003cp\u003eNo cutting or welding is required—this is a true direct bolt-on system designed to mount to factory points.\u003c\/p\u003e\u003cp\u003eWhy It Works\u003c\/p\u003e\u003cp\u003eEqual-Length Mid-Section: Balances pulses for a cleaner, smoother tone without losing aggression.\u003c\/p\u003e\u003cp\u003eH-Pipe Design: Improves scavenging for a fuller, more refined sound.\u003c\/p\u003e\u003cp\u003eDual-Mode Operation: Raw and loud (open) or subdued and civilized (closed).\u003c\/p\u003e\u003cp\u003eSound \u0026amp; Control\u003c\/p\u003e\u003cp\u003eValves Open: Aggressive, free-breathing tone with reduced rasp and improved high-rpm clarity.\u003c\/p\u003e\u003cp\u003eValves Closed: Stock-like sound levels for stealthy driving.\u003c\/p\u003e\u003cp\u003eElectronic Valve Control: Includes standalone controller; OEM integration available.\u003c\/p\u003e\u003cp\u003eConstruction \u0026amp; Options\u003c\/p\u003e\u003cp\u003eMaterials: T304 stainless steel or Grade 5 titanium.\u003c\/p\u003e\u003cp\u003eWeight Savings: –21.7 lb (Stainless) \/ –49.2 lb (Titanium) vs. OEM.\u003c\/p\u003e\u003cp\u003eCraftsmanship: Precision TIG welds and fully mandrel-bent tubing for maximum flow.\u003c\/p\u003e\u003cp\u003eTips: Multiple premium finish options to complement your M3 or M4.\u003c\/p\u003e\u003cp\u003eFitment\u003c\/p\u003e\u003cp\u003e2015–2018 BMW M3 (F80)\u003c\/p\u003e\u003cp\u003e2015–2020 BMW M4 Coupe (F82)\u003c\/p\u003e\u003cp\u003e2015–2020 BMW M4 Convertible (F83)\u003c\/p\u003e\u003cp\u003eInstallation Notes\u003c\/p\u003e\u003cp\u003eDirect bolt-on; no cutting or welding required.\u003c\/p\u003e\u003cp\u003e100% reversible—return to stock at any time.\u003c\/p\u003e\u003cp\u003eNote for S55 Owners: 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\u003cp\u003eWhat’s Included\u003c\/p\u003e\u003cp\u003e2.75\" equal-length H-pipe mid-section\u003c\/p\u003e\u003cp\u003e3.5\" axle-back with quad-chamber muffler\u003c\/p\u003e\u003cp\u003eElectronic valve system with controller (OEM integration optional)\u003c\/p\u003e\u003cp\u003eAll necessary clamps and hardware\u003c\/p\u003e\u003cp\u003eSpecifications\u003c\/p\u003e\u003cp\u003eMid-Section Diameter: 2.75\" equal-length with H-pipe\u003c\/p\u003e\u003cp\u003eAxle-Back Diameter: 3.5\"\u003c\/p\u003e\u003cp\u003eMaterial: T304 stainless steel or Grade 5 titanium\u003c\/p\u003e\u003cp\u003eValves: Electronic, rapid open\/close\u003c\/p\u003e\u003cp\u003eWeight Savings: –21.7 lb (Stainless) \/ –49.2 lb (Titanium) vs. OEM\u003c\/p\u003e\u003cp\u003eDesign: Quad-chamber muffler for refined closed-valve tone\u003c\/p\u003e","brand":"Valvetronic Designs","offers":[{"title":"Stainless Steel \/ 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