MAD BMW S58 4" Fat Boy Single Midpipe M2 G87 b58 catless downpipe your engine bay goes from

your engine bay goes from factory bland to performance showpiece

Introducing the ARM Motorsports S55 Single Midpipe Upgrade for the F8X platform

rear replacement panel package getting rid of all the ugly cheap plastic gives a true luxury sport sedan a rear end it deserves of this caliber to match its performance

Boxter spyder

MAD BMW S58 4" Fat Boy Single Midpipe M2 G87 b58 catless downpipe your engine bay goes fromBMW G87 M2 4" FATBOY Midpipe Flow Is Everything Flow is everything, and the new MAD 4" FATBOY Midpipe delivers exactly that for the BMW G87 M2. ETA: January 14th, 2026 Designed specifically for the S58 powered G87 platform, this midpipe is built to maximize both performance and sound without compromise. Featuring a full length single 4" center section and maintaining a minimum diameter of 3" throughout, the FATBOY Midpipe ensures optimal exhaust flow