Catless Downpipe – BMW B58 Engines
Unleash unrestricted flow and maximize the power potential of your B58 setup. This Catless Downpipe replaces the factory unit with a smooth, high-flow design, engineered for performance builds that demand sharper sound and faster spools, while maintaining precise fitment.
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Key Features
• Full-stainless steel catless downpipe designed for minimal restriction and enhanced exhaust gas flow
• TIG-welded construction with smooth bends—reduces turbulence for better spool and throttle response
• Lightweight relative to OEM unit—offers weight savings and increased exhaust sound depth under load
• Direct replacement for factory downpipe connection; select options for OPF vs. non-OPF fitment may be required
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Compatible Models (Triple Verified)
• BMW B58-equipped: M240i / 340i / 440i / 540i / 740i / related derivatives — chassis starting around 2016 onward.
Fitment note: OPF (Exhaust Particle Filter) and non-OPF versions differ; confirm which version your car has before purchasing.
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What’s Included
• (1) Stainless Steel Catless Downpipe (single piece or segmented depending on variant)
• Installation hardware not included on most products
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Why Buy From Eterna Motorworks
Eterna Motorworks is the standard in premium aftermarket automotive parts and services. With over a decade of hands-on craftsmanship, we deliver performance parts trusted by enthusiasts and pro builders for their quality, precise fitment, and lasting reliability. Every component is curated to improve your build—visually, audibly, and dynamically.
If serious performance matters to you—welcome to the team.
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Professional installation is highly recommended.
Installation hardware not included on most products.
Tuning is required to avoid Check Engine Light (especially for catless systems).
Confirm whether your B58 engine car has OPF or non-OPF configuration before purchase.
For fitment guidance, installation instructions, and store policy details, please refer to our policies before purchasing.
Worldwide shipping available upon request.
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Your next mod starts here. Upgrade the build the right way with Eterna Motorworks.
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Catless Downpipe – BMW B58 Engines
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Product Questions
Will this fit my vehicle?
This part is made for the models listed above. If you’re unsure, send us your year, make, and model and we’ll confirm fitment for you.
What’s included?
You’ll receive exactly what’s shown. Hardware is not included unless the product description says otherwise.
How difficult is installation?
We recommend professional installation. If you’re local, you can book an install with us directly. Some parts may need trimming, drilling, or adjustment depending on your setup.
Do you ship internationally?
Yes, we ship worldwide. Contact us if you need help placing an international order.
How do I confirm fitment before ordering?
Fitment details are listed on each product page. If you’re unsure or your build has unique specs, submit the form and our team will verify compatibility before you order.
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With over a decade of hands on experience, a growing portfolio of award winning show builds, and direct relationships with top-tier brands, we make sure you get premium products, trusted service, and real automotive expertise. Our team has built multiple award winning vehicles featured at top tier shows like SEMA and Bimmer Invasion. Everything we offer is tested, trusted, and backed by real world experience.
Eterna Motorworks can source or special-order nearly any component for your build — OEM-fitment parts, performance upgrades, carbon fiber aero, suspension, wheels, and even bespoke options depending on the platform. Click here to contact our team.
