BMW F90 M5 F92 M8 FAT BOY PRIMARY CATLESS DOWNPIPES

Experience the ultimate performance upgrade with our BMW F90 M5 / F92 M8 Fat Boy Primary Catless Downpipes (S63R). Designed to replace the restrictive factory catalytic converters, these downpipes unlock maximum exhaust flow, boost response, and horsepower — delivering an unmistakable sound and track-ready performance.

Constructed from premium 304 stainless steel, the Fat Boy 4.5" design ensures superior exhaust gas velocity and optimal turbo efficiency. Featuring precision CNC flanges and TIG-welded joints, these downpipes are built to handle extreme heat and pressure without compromise.

FITMENT:

• BMW M5 (F90)

• BMW M8 (F91 / F92 / F93)

• Engine: S63R 4.4L Twin-Turbo V8

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