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.
These premium downpipes feature 300‑cell high‑flow catalytic converters that improve power and sound while preventing check‑engine lights. Made from 304 stainless steel, they bolt directly to the stock exhaust system and are designed for BMW M3 G80/G81, M4 G82/G83 and M2 G87
Part number
MAD-121
Status
Ready to ship
Application window
Built for supported BMW S58 applications. Check the product description for G80/G81 M3, G82/G83 M4, and G87 M2 coverage before ordering.
Install requirements
Difficulty
Professional install recommended
Time
Varies by chassis and exhaust hardware condition
Tools
Lift access, exhaust tools, O2 sensor tools, and new hardware as needed
Recommendation
Inspect clamps, gaskets, sensors, and clearance during installation.
Installation notes
Confirm supporting hardware and calibration requirements before installation.
Shipping
Orders ship with tracked delivery and insurance coverage options at checkout.
Returns
Unopened items may be returned inside the stated return window per policy terms.
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