Product Description
BMW G8X S58 4" Fatboy Single Midpipe - Mastery of Art and Design MAD-124
Flow is everything and the new MAD 4" FATBOY Midpipe delivers exactly that.
Designed specifically for the G8X M3/M4 platform, this midpipe is built to maximize performance and sound without compromise. Featuring a full-length single 4" center section and a minimum pipe diameter of 3" throughout, the FATBOY Midpipe is all about maintaining optimal exhaust flow from front to back.
Expect a deeper, more aggressive tone with significantly less rasp, even when paired with aftermarket downpipes. Whether you're pushing the limits on track or just want that perfect balance of refined aggression on the street, the FATBOY Midpipe transforms your G8X's character in all the right ways.
Features:
- Full-length single 4" center section
- Minimum 3" diameter throughout for consistent flow
- Deeper, more refined exhaust note with reduced rasp
- Perfect pairing with aftermarket or stock downpipes
- Includes 3" and 2.75" reducer couplers to connect to 3'' aftermarket axle-backs such as ours or factory axle-back systems
- Utilizes Oem Cut location and clamp design for easy installation and reversibility
Fitment:
- 2021+ BMW G80 M3, M3 Competition, and M3 Competition xDrive
- 2021+ BMW G82 M4, M4 Competition, and M4 Competition xDrive
- 2021+ BMW G83 M4, M4 Competition, and M4 Competition xDrive

Mastery of Art & Design (MAD) specializes in BMW bolt-on aftermarket parts. Our current catalog includes BMW charge pipes and intercoolers. All high-quality pieces at an unbeatable price! We provide a lifetime warranty against defects and fitment issues on all MAD products. MAD offers 90-days to return any product; if you do not like it, send it back for a full refund!