ETA August 1st 2026

Upgrade from the stock N55 downpipe to the MAD N55 catted downpipe for maximum airflow, power, and sound!

Introducing the Mad Catted N55 Downpipe, the perfect upgrade for BMW enthusiasts looking to enhance their vehicle's performance and exhaust sound.

Crafted from premium quality 304 stainless steel, this downpipe is built to withstand extreme temperatures and harsh driving conditions. The smooth transition of our piping design ensures maximum exhaust flow, which results in increased horsepower, torque, and throttle response.

The Mad Catted N55 Downpipe is also equipped with high-flow catalytic converters, which help to reduce harmful emissions while maintaining optimal performance levels. The catalytic converters are engineered to deliver maximum flow and minimal back pressure, which results in a noticeable improvement in engine sound and overall driving experience.

The downpipe is designed to bolt-on directly to the stock exhaust system and does not require any cutting or welding, making installation quick and hassle-free. The Mad Catted N55 Downpipe is also compatible with aftermarket exhaust systems, providing you with endless customization options to suit your preferences.

Don't settle for stock performance - upgrade to the Mad N55 200 Cell Race Catted Downpipes and experience the true potential of your BMW.

Race use only 

Features:

• Smooth bends for maximum airflow without any drone

• 200 Cell euro 5 catalytic converter 

• Reduces smell while retaining maximum performance 

• Up to 30HP increase on the stock turbos, even more on upgraded turbos

• Lifetime warranty on defects and fitment

• 90 day return period

• All orders ship in 1-2 business days

• Spot on fitment

 

Fitment: EWG only

• 2014-2015 M135i & Xdrive (After 07/13 production)

• M235i & Xdrive

• M2

• 2014-2015 335i & Xdrive (After 07/13 production)

• 435i & Xdrive

• 2016 X4 M40i 

Disclaimer:
For race use only. This product is not certified for use on public roads and may not comply with local emissions regulations. Additionally, it does not prevent the illumination of the Check Engine Light (CEL). Please consult your local laws and regulations before installation.