MAD BMW Toyota B58 Fat Boy 5″ Catless Downpipe M240 340 440 Supra MAD-2052

MAD B58 Fat Boy 5” Catless Downpipe

Upgrade your BMW or Toyota Supra B58 engine with the MAD 5-inch Catless B58 Downpipe—a high-performance aftermarket upgrade designed to dramatically enhance power, torque, and exhaust flow.

Why Choose the MAD Fat Boy Downpipe?

Crafted from premium-grade stainless steel, this precision-engineered downpipe boasts a wide 5-inch diameter that minimizes exhaust restrictions and backpressure. Its catless design eliminates the factory catalytic converter, unleashing the full potential of your turbocharged B58 engine for significant horsepower and torque gains—expect up to 30HP increase on a tuned stock turbo setup, with even more power on vehicles equipped with upgraded turbos.

Key Features:

• Premium Stainless Steel Construction — Durable and built to withstand extreme heat and driving conditions

• 5-inch Diameter — Ensures maximum, unrestricted exhaust flow

• Catless Design — Removes factory catalytic converter for enhanced performance and aggressive exhaust tone

• Smooth Mandrel Bends — Optimized airflow with no drone

• Lifetime Warranty — Coverage on defects and fitment for peace of mind

• Flex Section Included — Adds durability and flexibility to the exhaust system

• Easy Installation — Designed for a seamless fit with the stock exhaust, compatible with right-hand and left-hand drive models

• 90-Day Return Policy — Risk-free purchase with hassle-free returns

• Fast Shipping — Orders ship within 1-2 business days

Fitment:

• 2015+ BMW M240i & xDrive

• 2016-2019 BMW 340i & xDrive

• 2016+ BMW 440i & xDrive

• 2016+ BMW 540i & xDrive

• 2016+ BMW 740i & xDrive

• 2017-2020 BMW X3 M40

• 2017-2020 BMW X4 M40

• 2019+ Toyota Supra 3.0L

The Perfect Upgrade for B58 Enthusiasts

Whether you want to unlock serious power gains or transform your exhaust note, the MAD B58 Fat Boy 5” Catless Downpipe is a must-have for any enthusiast looking to get the most from their BMW or Supra B58 engine.