


MAD BMW S58 4" Fat Boy Single Midpipe M2 G87
Flow is everything — and the MAD 4" Fat Boy Midpipe delivers it for the G87 M2. Built for the S58 platform, it runs a full-length single 4" center section with a minimum 3" diameter throughout, so exhaust flow stays unrestricted and throttle response sharpens.
The result is a deeper, smoother, more aggressive tone with noticeably less rasp — even with aftermarket downpipes. Track or street, it brings out the best in the G87 M2.
Key features
- Full-length single 4" center section for maximum flow.
- Minimum 3" diameter throughout to eliminate restrictions.
- Deep, aggressive tone with reduced rasp.
- Compatible with both stock and aftermarket downpipes.
- Includes 3" and 2.75" reducer couplers to fit aftermarket or factory axle-back systems.
- Uses the factory cut point and clamp system for an easy, reversible install.
- Includes an upgraded brace for proper clearance with the larger midpipe.
Fitment
BMW M2 (G87) with the S58 engine.
Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email support@korespeed.com.
Pairs well with

MAD BMW S58 4" Fat Boy Single Midpipe M2 G87
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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