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Valvetronic Designs 2021-2025 Bmw G8x M3 / M4 Valved Sport Exhaust System
or as low as $141.58/mo with Affirm
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
- 2021+ BMW G80 M3
- 2021+ BMW G82 M4 (Coupe)
- 2021+ 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
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