MAD G87 S58 4" FATBOY Single Midpipe – BMW M2 (G87)

In Stock: Ships in 1-2 business days
Available to Order: Ships in 3-4 Weeks

Looking to unlock the full potential of your G87 M2 exhaust setup?

The factory midpipe restricts the true character of the S58 — especially once you start adding power.

The MAD 4” FATBOY Midpipe eliminates that restriction with an oversized, free-flowing design built for maximum performance and sound.

This isn’t just an upgrade — it’s a complete transformation of how your M2 breathes and sounds.

Deep.
Aggressive.
Unfiltered.

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Why this Midpipe

The 4” FATBOY design is all about one thing — flow.

With a full-length 4” center section and a minimum 3” diameter throughout, this midpipe removes the bottlenecks found in the OEM system and even smaller aftermarket options.

The result:

• Noticeably deeper tone

• Increased volume without the “tinny” sound

• Reduced rasp compared to typical non-resonated setups

• A more raw, aggressive exhaust note that matches the M2's performance

Even when paired with catless downpipes, this setup is designed to maintain a controlled sound profile while delivering a raw, unfiltered experience.

If you’re tired of muted or overly refined setups, this is the upgrade that finally wakes up your M2.

Maximum flow.
Maximum presence.
No compromise.

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Installation Overview

• Uses OEM cut location for straightforward installation

• Clamp-on design allows for reversibility

• Includes reducer couplers for multiple axle-back setups

• Professional installation recommended

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Fitment

BMW G87 Platform:

• G87 M2 (S58)

Compatible with the factory rear exhaust and most aftermarket axle-back systems.

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Construction

• Full-Length 4” Single Midpipe Design

• Minimum 3” Diameter Throughout

• 304 Stainless Steel Construction

• Mandrel Bent for Maximum Flow

• OEM-Style Clamp Design for Easy Installation

• Includes 3” and 2.75” Reducer Couplers

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What's Included

• MAD 4” FATBOY Midpipe

• Brace

• Reducer Couplers (3” and 2.75”)

• Clamps and Required Hardware

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Warranty & Returns

• Eligible for a 90-day return window if unused, uninstalled, and in original condition

• Backed by a lifetime warranty on defects and fitment

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Automaz Approved

Not all loud exhaust setups sound good — and that’s where the FATBOY stands out.

The 4” FATBOY Midpipe brings a deeper, more aggressive character to the G87 M2 while maintaining the flow capacity needed for higher-performance S58 builds.

If you want maximum flow and a raw, dominant exhaust note — this is it.