BMW G8x M3 / M4 Valved Sport Exhaust SystemBMW G80 M3 G82G83 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 carits 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

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.
  

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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)