BMW G80/G81 M3 Single-Flow Exhaust Midpipe – Merged Single-Pipe Design for Reduced Restriction & Deeper Exhaust Tone (2021+)

Unleash a deeper, smoother, and more refined tone from your S58-powered BMW G80/G81 M3 with the BAVMODS® Single-Flow Midpipe — a performance-engineered solution designed to enhance exhaust flow, eliminate rasp, and reduce unwanted drone while maintaining daily-drive comfort.

From the factory, the G80’s dual midpipe design creates uneven exhaust pulses and excess backpressure, contributing to a sharp, raspy tone. The BAVMODS® Single-Flow Midpipe merges both exhaust banks into a single large-diameter pipe, allowing exhaust gases to flow more freely. The result is a cleaner, deeper, and more aggressive sound profile with smoother tone transitions and improved throttle response.

Engineered for Flow & Sound Precision

Crafted from high-grade T304 stainless steel, this midpipe is mandrel-bent and TIG-welded for optimal flow and long-term durability. The merged single-pipe design reduces restriction and enhances exhaust scavenging, improving both low-end torque and top-end flow.

This configuration creates a more unified exhaust tone, eliminating high-frequency rasp while retaining that signature BMW aggression — a true OEM+ sound upgrade that complements both stock and tuned setups.

Key Features & Benefits

• Single-Flow Merged Design – Reduces restriction and unifies exhaust flow for a smoother tone.
• Deeper, Cleaner Sound – Eliminates rasp and harsh resonance for a refined, aggressive note.
• Mandrel-Bent T304 Stainless Construction – Corrosion-resistant, free-flowing, and built to last.
• Improved Exhaust Scavenging – Enhances throttle response and turbo spool characteristics.
• OEM+ Fitment – Direct bolt-on design compatible with stock or aftermarket downpipes and rear sections.
• Balanced Acoustic Character – Aggressive under throttle, controlled at cruising speeds.

The BAVMODS® Single-Flow Midpipe transforms your G80/G81’s exhaust note into a deep, smooth, and harmonized tone, reducing rasp and creating a more refined, motorsport-inspired sound. Expect subtle performance gains, cleaner exhaust flow, and a tone that complements the S58 engine’s raw power without overwhelming daily comfort.

FITMENT: BMW M3 (G80 Sedan), M3 Touring (G81) — including Competition, CS & xDrive models (2021+)

ENGINE COMPATIBILITY: S58B30T0 – 3.0L Twin-Turbo Inline-6

IMPORTANT NOTE: All exhaust systems are custom fabricated to order. These are not generic third-party exhausts — our team handles each system in-house, and you’ll be able to see the craftsmanship immediately upon unboxing.

While materials are sourced worldwide, all final metalwork, quality assurance testing, and fitment/mounting verification are completed at our facility in Texas, United States.

Because of the extensive labor involved and the high cost/risk of return shipping exhaust systems, full returns are not accepted. However, if there is ever a verified fitment issue, we will 100% stand by our guarantee and, with proper documentation, make sure you are taken care of.

Please note: once an order is placed, if we are not contacted within 24–48 hours of order placement, cancellations cannot be promised.

Each exhaust unit takes approximately 2–3 weeks for full fabrication. Once fabrication is complete and the system is in quality assurance testing, we will send detailed photos of your exhaust for you to review and approve so you feel fully confident before it ships.

Please refer to the “Fitment” section in the product description for compatibility details.