MAD B58 4.5" Catted Downpipe w/ Bracket
Pipe size 4.5 inch
Catalyst High-flow catted
Application B58 BMW / Supra
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

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.

This 4.5-inch catted downpipe for the BMW B58 engine uses premium 304 stainless steel and a high‑flow catalytic converter to improve exhaust flow while maintaining emissions control. It delivers noticeable horsepower and torque gains, retains OEM fitment with smooth bends and a flex section, and installs as a direct bolt-on. Compatible with left‑hand and right‑hand drive vehicles, it fits BMW M240i, 340i, 440i, 540i, 740i, X3/X4 M40, X5 40i, X7 40i, Z4 M40i and Toyota Supra

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