BMW B58 Performance Parts

BMW B58 Performance Parts: 900 HP Turbo Systems & High-Flow Downpipes

The BMW B58 is the 3.0-litre turbocharged inline-six that sits at the top of BMW's non-M performance range. It powers the M140i, M240i, M340i and M440i, the X3 M40i and Z4 M40i — and, famously, the Toyota GR Supra A90 3.0. With a closed-deck block, a forged crankshaft and generous cooling from the factory, the B58 has earned a reputation as one of the strongest six-cylinder tuning platforms of its generation. It is an engine that rewards a properly planned build.

The B58 tuning path, explained

The staged approach applies to the B58 just as it does to any modern turbo engine. Stage 1 is a software remap within the limits of the stock turbocharger and exhaust. Stage 2 introduces the breathing hardware — above all a high-flow downpipe, often alongside an upgraded intercooler — so a more aggressive calibration has the airflow it needs. Stage 3 replaces the factory turbocharger entirely, which is where the B58's famously strong bottom end lets it operate in territory few stock-block engines can reach. The key at every stage is matching hardware and software: neither works to its potential without the other.

What RO34 stocks for the B58

Our B58 collection focuses on the components that define serious Stage 2 and Stage 3 builds:

• 900 HP performance turbo systems — including a system for the B58 Gen 2 and Toyota Supra A90, and a Garrett G30-900 based turbo upgrade for B58 Gen 1 engines and the Supra A90.
• Heat-shielded high-flow downpipes — the essential Stage 2 exhaust component for the M140i, M340i, 440i and Supra, combining maximum flow with thermal protection for surrounding components in the tight B58 engine bay.

Everything here is chosen with an OEM-grade fitment focus — parts engineered for the specific chassis and engine generation they list, not universal approximations.

Gen 1 or Gen 2? Check before you buy

The B58 exists in two distinct generations with meaningful hardware differences, and BMW fitted it across many chassis. If you are unsure which generation your car runs or whether a part matches your exact model, send us your VIN via our contact page and we will confirm fitment before you place the order.

Shipping and returns

Every order ships from Spain within 24–48 hours with DHL, UPS or FedEx, and all purchases are covered by a 30-day return policy.

BMW B58 FAQ

Is a downpipe enough for Stage 2?

On the B58, a high-flow downpipe is the core Stage 2 hardware, and it must be paired with matching Stage 2 software to deliver its benefit. Many owners add an upgraded intercooler at the same time to keep charge temperatures consistent under sustained load.

Will these parts fit my exact model?

Each listing specifies the supported chassis and B58 generation (Gen 1 or Gen 2). Because the differences between generations matter, we recommend sending us your VIN before ordering — we will verify compatibility with your exact vehicle before you buy.

Do you ship outside Spain?

Yes. Orders dispatch from Spain within 24–48 hours via DHL, UPS or FedEx, with delivery across Europe and beyond, and every order includes our 30-day return policy.