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G8X M3 / M4 4" FATBOY Midpipe – Flow Is Everything
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.
Key Features:
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Full-length single 4" center section
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Minimum 3" diameter throughout for consistent flow
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Deeper, more refined exhaust note with reduced rasp
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Perfect pairing with aftermarket or stock downpipes
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Includes 3" and 2.75" reducer couplers to connect to 3'' aftermarket axle-backs such as ours or factory axle-back systems
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Utilizes Oem Cut location and clamp design for easy installation and reversibility
Fitment:
- 2021+ BMW G80 M3
- 2021+ BMW G82 M4
Fitment
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If a part doesn't fit as expected, contact us and we'll work with you to resolve it.
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Returns
- Unused, uninstalled parts can be returned or exchanged within 30 days of the order date.
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- Returns can have up to a 20% restocking fee.
- Built-to-order and special-order items can't be returned or cancelled once production begins.
Shipping
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Warranty
- All parts retain the manufacturer's warranty.
- Warranty claims are subject to the manufacturer's approval.