BMW G8x M3 / M4 Valved Sport Exhaust System

BMW G8x M3 / M4 Valved Sport 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)