MAD B58 Gen 3 5" 200-Cell Catted Downpipe (2025+)
Pipe size 5 inch
Catalyst 200-cell high-flow catted
Application 2025+ B58 Gen 3
Build data

Specs that matter for this part

Hardware

Flow-focused exhaust path

Large-diameter tubing, smooth bends, and a flex section reduce restriction versus the factory exhaust path.

Validation

Catalyst configuration

200-cell high-flow catted setup. Review local emissions requirements and product notes before street use.

Requirement

Direct bolt-on hardware

Designed to retain OEM-style fitment without cutting or welding on supported applications.

Downpipes can affect emissions readiness, sound level, and calibration needs. Review the product description before ordering.

For the 2025+ B58 Gen‑3 engines, this 5-inch downpipe includes a 200‑cell high‑flow catalytic converter that refines the exhaust tone while enhancing power. Constructed from 304 stainless steel with smooth 5-inch piping, it offers a deeper, more controlled sound and significant horsepower and torque gains while ensuring emissions compliance. It fits 2025+ BMW M340/M440, X3 G45 M50 and X4 G46 M50 models

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