BMW G8x M3 / M4 Valved Sport Exhaust System

BMW G80 M3 / G82–G83 M4 Exhaust System Single 3.5" Equal-Length Mid-Pipe + Optional Valved Axle-Back (T304 Stainless or Grade 5 Titanium) Overview The G80/G82/G83 is a phenomenal M car—its soundtrack just needs to catch up. Our single 3.5" equal-length mid-pipe unlocks the character the S58 deserves without requiring changes to the OEM rear section. Add the Valvetronic Designs valved axle-back for even more presence and control. Compatible with OEM downpipes or free-flow front pipes, this system is engineered to deliver a higher-pitch, refined note with zero check-engine lights. Sound With Free Flow Downpipes: Sound With Stock Downpipes: Why It Works Equal-length design: Balances exhaust pulses for a smoother, higher-frequency tone. Single 3.5" mid-section: Optimized flow for improved response and power throughout the rev range. Modular by design: Pairs with OEM or aftermarket rear sections; upgrade path to our valved axle-back at any time. Sound & Control With stock downpipes: Noticeably crisper, more engaging tone without drone. With our valved axle-back (optional): Quad-chamber muffler and OEM-style valves deliver daily-driver civility closed, and an aggressive, motorsport edge opened—at the touch of a button. No CEL: System is designed to avoid check-engine lights. Construction & Options Materials: T304 stainless steel or ultra-light Grade 5 titanium. Weight savings: Up to –57.8 lb (Titanium) or –24.7 lb (Stainless) vs. factory. Craftsmanship: Precision TIG welds, fully mandrel-bent tubing, and included cross brace for rigidity. Tips: Premium double-wall or single wall tips included. Valve Integration Electronic valve control with included controller for rapid open/close. OEM integration available if you prefer factory valve control behavior. Fitment 2020+ BMW G80 M3 2020+ BMW G82 M4 (Coupe) 2020+ BMW G83 M4 (Convertible) Installation Notes Mid-pipe and axle-back can be installed independently. When installing only a mid-pipe or axle-back, make the rear-section cut at the second dimple on the OEM pipe to ensure proper fitment. 100% reversible—return to stock at any time. CLICK HERE FOR INSTALL GUIDE Compatibility Notice (V3 Systems) V1/V2 components are not compatible with V3. The V3 mid-pipe includes additional clearances at the downpipe connection and mid-section; small visible gaps prior to tightening are normal and by design. What’s Included Single 3.5" equal-length mid-pipe assembly Cross brace Optional: Valved axle-back with controller and tips Hardware and clamps Specifications Tubing diameter: 3.5" mid-pipe; 2.75" axle-back Materials: T304 stainless steel or Grade 5 titanium Finish: Brushed (Stainless) or raw/brushed (Titanium) Valves: Electronic, with remote controller (OEM integration available)