MAD BMW S58 4" Fat Boy Single Midpipe M3 M4 G80 G82 - MAD-124

Flow is everything—and the MAD 4" FAT BOY Midpipe is engineered to maximize exhaust performance for the G8X M3/M4 platform. With a full-length 4-inch center section and a minimum 3-inch diameter throughout, this midpipe is all about uncompromising airflow and aggressive sound enhancements.

Expect a deeper, more refined exhaust tone with significantly less rasp, even when paired with aftermarket downpipes. Whether you’re on the track or cruising the streets, the FAT BOY Midpipe brings out the best of your BMW’s S58 engine. 

Key Features:

• Optimized Flow: Full-length 4" single midpipe ensures maximum exhaust efficiency.
• Minimum 3” Diameter Throughout: Guarantees consistent flow and peak performance.
• Deeper, Aggressive Exhaust Note: Reduces rasp for a clean, refined tone.
• Perfect for Aftermarket or Stock Downpipes: Compatible with both OEM and performance setups.
• OEM Cut & Clamp Design: Simple installation with full reversibility.
• Versatile Fitment: Includes 3" and 2.75" reducer couplers for seamless integration with stock or aftermarket axle-backs.

Why Choose the MAD FAT BOY Midpipe?

For G80/G82 M3 & M4 owners looking for the best balance of power, sound, and quality, the MAD 4" FAT BOY Midpipe is the ultimate upgrade. It eliminates restrictive sections of the factory exhaust, enhances engine response, and produces a race-inspired tone—all while maintaining street drivability.

Specifications:

• Material: High-quality stainless steel
• Design: Full-length 4” center section, minimum 3” diameter throughout
• Sound Profile: Deep, refined, and aggressive with minimal rasp
• Compatibility: Works with OEM & aftermarket downpipes
• Includes: 3” & 2.75” reducer couplers for seamless installation

Installation Information:

• OEM Cut Location & Clamp Design for easy installation & full reversibility
• Professional installation recommended for optimal fit and performance

Suitable Vehicles:

• BMW M3 G80 (2021+)
• BMW M4 G82 (2021+)

Order with Confidence:

• Fast Shipping Available
• Easy Returns & Exchanges
• High-Quality Craftsmanship

Unleash the true potential of your BMW G80/G82 M3 & M4 with the MAD 4" FAT BOY Midpipe—because flow is everything.