Upgrade the stock B46 downpipe to the MAD B46 Catted Downpipe for more airflow, power and a cleaner exhaust tone — while keeping your setup street-friendly. The built-in high-flow cat reduces restriction versus the factory unit so the turbo spools quicker and pushes more power, all while preserving drivability.

On a tuned B46 with the stock turbo, expect gains of up to 30 HP — even more on upgraded turbos. The flex section absorbs stress from engine movement and heat cycles for a long-lasting, reliable upgrade.

Features

• High-flow 200-cell catalytic converter.
• Compatible with right- and left-hand-drive vehicles.
• Smooth mandrel bends for maximum flow with no drone, plus a flex section.
• Lifetime warranty on defects and fitment; 90-day return; ships in 1–2 business days; direct bolt-on fitment.

Fitment (U.S. B46 models only; not compatible with OPF vehicles)

• 2016+ BMW 120i & 125i
• 2016+ BMW 220i & 230i
• 2016+ BMW 320i, 330e & 330i (F & G chassis)
• 2016+ BMW 420i & 430i
• 2020+ Toyota Supra 2.0

Emissions disclaimer: This product is not legal for sale or use on pollution-controlled vehicles operated on public roads and is intended for off-road, race, or closed-course competition use only. You are responsible for compliance with all applicable emissions laws; use on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws. Please check your local laws before purchase and installation.

Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email support@korespeed.com.