MAD B58 5" Catted Downpipe w/ No CEL Guarantee
Pipe size 5 inch
Catalyst High-flow catted / No-CEL claim
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 / No-CEL claim 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.

Crafted from premium 304 stainless steel, this 5-inch downpipe features a 300‑cell high‑flow catalytic converter and smooth piping that maximizes exhaust flow while ensuring there is no check engine light. It provides deeper exhaust tone, improved power and torque, and comes with a two‑year no‑CEL guarantee. It’s a direct bolt-on fitment for BMW M240i, 340i, 540i, 740i, X3/X4 M40, X5 40i, X7 40i, Z4 M40i and Toyota Supra

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