MAD BMW F & G Chassis B46 Downpipe 220 230 320 330 420 430 730 Catted

Upgrade from the stock B46 downpipe to the MAD B46 catted downpipe for maximum airflow, power, and sound.

The MAD BMW B46 catted downpipe is the perfect upgrade for getting more performance and a cleaner exhaust tone while keeping your setup street-friendly. The built-in high-flow catalytic converter reduces restriction compared to the factory cat, allowing your turbo to spool quicker and push more power. At the same time, it helps maintain drivability.

On a tuned BMW B46 with the stock turbo, you can expect gains of up to 30 horsepower, with even more on upgraded turbo setups.

The flex section helps reduce stress from engine movement and heat cycles, making it a long-lasting, reliable upgrade.

This downpipe is designed specifically for U.S. B46 models and is not compatible with vehicles equipped with OPF.

Features

• High-flow catalytic converter

• High-flow 200 cell catalytic converter

• Compatible with right-hand drive and left-hand drive vehicles

• Smooth mandrel bends for maximum flow and no drone

• Up to 30HP gain on stock turbos, more with upgraded setups

• Flex section for added durability

• Lifetime warranty on fitment and defects

• Ships within 1 to 2 business days

• Direct bolt-on fitment

Fitment

Note:

• U.S. model fitment only (B46 engines)

• Not compatible with vehicles equipped with OPF

SKU: MAD-132

Emissions Disclaimer:
This product is not legal for sale or use on pollution-controlled vehicles operated on public roads, highways, or streets. It is intended for off-road, race, or closed-course competition use only, where such modifications are permitted.

By purchasing this product, you acknowledge and agree that:

• You are responsible for compliance with all applicable emissions laws and regulations.

• MAD and its affiliates disclaim any liability for improper or unlawful use of this product.

• Use of this part 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.

The items installed or applied to vehicles are intended strictly for off-road use only and track vehicles. These modifications may not comply with emissions, safety, or environmental regulations required for public road use under Environmental Regulatory Agency (ERA) laws. It is the sole responsibility of the vehicle owner or operator to ensure adherence to all applicable local, state, and federal regulations. Use on public roads may result in legal penalties or vehicle impoundment. Always verify compliance with local authorities before installation.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

If you're unsure whether a part will fit your vehicle, feel free to contact us here with your inquiry. Our helpful sales team will reach out to confirm if it's the right match for you.

We offer a flat-rate shipping fee across the continental United States. This excludes Alaska, Hawaii, and U.S. territories. For international orders, additional shipping costs will apply. Please contact us for a quote if you are outside the continental U.S.

Also, feel free to also contact us at ColoradoN5X@Gmail.Com for any other questions.

Not all items are covered by warranty. Items including warranty, will clearly state that there is warranty within the product description. Most of these items will be a standard 1-year warranty against manufacture defects. You, the customer, will be responsible for shipping and handling. We will fix/replace that item with a product that is in working condition if you meet the warranty criteria. Please note that you will be allowed ONLY 1 claim within the year for that product. ColoradoN5X is not responsible for any damage caused during the installation of our products.