If you’re looking to unleash the full potential of your turbocharged BMW, upgrading to B58 downpipes is one of the smartest moves you can make. The B58 engine, found in popular models like the BMW M340i, 540i, Z4 M40i, and Toyota Supra, is already a beast—but it truly comes alive with the right performance parts. In this guide, we’ll explore the best b58 downpipes, how they work, and why they’re essential for serious enthusiasts.
B58 downpipes are components in your exhaust system that connect the turbocharger to the rest of the exhaust. They replace the restrictive factory downpipe with a high-flow or catless version, allowing exhaust gases to flow more freely. This improved flow reduces backpressure and turbo lag, allowing your B58-powered BMW to produce more power, quicker spool, and a throatier exhaust note.
Upgrading to B58 downpipes offers several key benefits:
There are two main types of B58 downpipes available:
These remove the catalytic converter entirely, providing maximum performance gains and the most aggressive sound. However, catless B58 downpipes may trigger a check engine light (CEL) and are not legal for street use in some areas.
These include a high-performance catalytic converter that reduces emissions while still improving performance. They’re ideal for drivers who want the best of both worlds—power and compliance.
Here are some of the most recommended B58 downpipes trusted by tuners and racers:
The VRSF catless B58 downpipe is a favorite for performance builds. It’s made from high-quality stainless steel and delivers serious power gains with aggressive sound.
This premium high-flow catted B58 downpipe balances performance and street legality. It’s ideal for daily drivers who still want serious performance.
CTS Turbo offers both catless and catted B58 downpipes. Their downpipes are known for excellent weld quality and precise fitment.
Installing B58 downpipes usually takes 2–3 hours with the right tools. While some owners install them at home, many prefer professional installation. Tuning is highly recommended to maximize the gains and eliminate any CELs that might appear due to changes in emissions flow.
Custom tuning options like Bootmod3 or MHD work exceptionally well with aftermarket B58 downpipes, unlocking their full performance potential.
Absolutely. Whether you’re chasing horsepower numbers, looking to enhance your BMW’s sound, or preparing for more aggressive mods like upgraded turbos, B58 downpipes are an essential upgrade. They are the foundation of any serious B58 performance build.
At Rvng RaceWorks, we’re passionate about delivering quality performance upgrades. If you’re ready to level up your BMW’s output, check out our handpicked selection of premium B58 downpipes designed to push your turbocharged beast to the next level.