[mike@x-ph.com]

The most popular downpipe just got even better! You now have the option to choose between the premium GESI catalytic converters or the more affordable Active Autowerke cats. Both options come with the same no Check Engine Light (CEL) guarantee and comprehensive warranty.



Active Autowerke B58 Catted Downpipe – Unleash Your BMW's True Potential
Enhance your BMW's performance and sound with the Active Autowerke B58 Catted Downpipe.

Key Features:
High-Flow Active Autowerke Catalytic Converter

Engineered to maximize exhaust flow while reducing emissions.
Guarantees no Check Engine Light (CEL) issues.
Comes with Active Autowerke's exclusive warranty for peace of mind.
Stainless Steel Construction

Made from premium 304 stainless steel for durability and corrosion resistance.
Precision TIG-welded for strength and longevity.
Optimized Performance

Increases horsepower and torque by reducing exhaust backpressure.
Enhances turbo spool and throttle response for a more exhilarating drive.
Improved Exhaust Note

Delivers a more aggressive and sporty sound without excessive cabin drone.
Direct Bolt-On Installation

Designed for a seamless fit with OEM mounting points.
Includes all necessary hardware and gaskets for a hassle-free installation.

Why Choose the Active Autowerke B58 Catted Downpipe?
Upgrade your BMW's exhaust system with confidence. The Active Autowerke catted downpipe is specifically designed for B58 engines, ensuring optimal compatibility and performance. Unlike other downpipes that use generic catalytic converters, this model features Active Autowerke's proprietary cat, which is engineered to prevent CEL issues while delivering maximum flow.

Compatibility:
BMW Models Equipped with the B58 Engine:
2 Series: M240i, M240i xDrive
3 Series: 340i, 340i xDrive
4 Series: 440i, 440i xDrive
5 Series: 540i, 540i xDrive
Z4 M40i
Toyota Supra (A90)

Active Autowerke Warranty:
Rest assured with Active Autowerke's warranty on the catalytic converter. Their commitment to quality ensures that you're getting a product that not only boosts performance but is also built to last.

Unlock Hidden Power Today
Don't let the factory downpipe hold back your BMW's true capabilities. Upgrade to the Active Autowerke B58 Catted Downpipe and experience significant gains in power, sound, and overall driving enjoyment.

[Red_sir]

Cool... but how does it compare with the original?

[mike@x-ph.com]

Originally Posted by Red_sir

Cool... but how does it compare with the original?

From everything i am seeing, its identical

[speed817]

Price? And when will it be available?

[mike@x-ph.com]

Originally Posted by speed817

Price? And when will it be available?

its available now, dm sent

[M240xSI]

I am taking delivery of a brand new 2025 M240 xdrive. Will this fit? Not sure if there are any changes for the new model year. I would like to add some sound and power with getting a CEL. Also, will I pass emissions test?

[mike@x-ph.com]

Originally Posted by M240xSI

I am taking delivery of a brand new 2025 M240 xdrive. Will this fit? Not sure if there are any changes for the new model year. I would like to add some sound and power with getting a CEL. Also, will I pass emissions test?

no changes, it will fit without a CEL