MAD BMW S58 4" Fat Boy Single Midpipe M2 G87BMW G87 M2 4" FATBOY Midpipe Flow Is Everything ETA Jan 2026 Flow is everything, and the new MAD 4" FATBOY Midpipe delivers exactly that for the BMW G87 M2. 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 and
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