Downpipe for B58 M240i 340i 440i 540i 740i Drive 2016+ 4.5inch catted with heat shield

Upgrade your BMW’s performance and unleash its full potential with our 4.5” High-Flow Catted Downpipe with Heat Shield, engineered specifically for B58-powered models including the M240i, 340i, 440i, 540i, and 740i xDrive from 2016 onwards. This premium downpipe is designed to significantly improve exhaust flow, reduce backpressure, and enhance turbo efficiency — all while maintaining daily drivability and emissions consciousness.

Crafted from T304 stainless steel, it features a massive 4.5-inch diameter inlet that tapers smoothly to a 3.5-inch outlet, allowing for optimized gas flow and quicker turbo spool. The integrated 200-cell high-flow catalytic converter strikes the perfect balance between performance and emission compliance, making it ideal for both street and spirited use. A custom-fitted laser-cut heat shield offers essential thermal protection, keeping engine bay temperatures in check and safeguarding surrounding components.

Precision TIG-welded for strength and durability, the downpipe includes pre-installed O2 sensor ports for seamless integration with your vehicle’s electronics. Designed as a direct bolt-on replacement, it is compatible with OEM and most aftermarket exhaust systems, ensuring a hassle-free installation. This upgrade delivers noticeable improvements in throttle response, horsepower, and an enhanced, deeper exhaust tone.

Compatible BMW B58 models (2016+):

• M240i / M240i xDrive

• 340i / 340i xDrive

• 440i / 440i xDrive

• 540i / 540i xDrive

• 740i / 740i xDrive