Description

Designed, machined, and welded entirely in-house at our shop in Fort Worth, TX, this billet manifold is engineered for high-performance Gen 2 B58 applications. With an upgraded intercooler core and support for port injection, it’s built for enthusiasts pushing well beyond stock power levels.

Fuel rail included. Injectors and a port injection line kit are required and not included.

Key Features:

• 70% larger intercooler core (Wagner Tuning) for improved thermal efficiency

• Thermal (phenolic) spacer to reduce heat soak between engine and manifold

• Integrated -8AN ORB fuel rail (included)

• Supports EV14K Body (Bosch Shorty) injectors

• 6 x 1/8″ NPT secondary ports for meth/nitrous

• 3 x 1/8″ NPT auxiliary ports for accessories (e.g., boost reference)

• Coolant return line with OE fitting included

• OEM oil filter remains fully accessible

• Available in raw aluminum

Designed for BMW B58 Gen 2 Engines, Including:

• M340i / M440i – G20 / G22 (2019+)

• M240i – G42 (2021+)

• Toyota Supra – A90/A91 (2020+)

• Z4 M40i – G29 (2018+)

• X3 M40i / X4 M40i – G01 / G02 (2019+)

• 540i – G30 / G31 (2020+)

• 740i – G12 (2020+)

• 840i – G14 / G15 / G16 (2020+)

• X5 / X6 / X7 40i – G05 / G06 / G07 (2018+)

Installation & Support

This manifold is designed for plug-and-play fitment using OEM mounting points. Installation guides and support are available by contacting us directly.

Why Choose RK

Every RK billet manifold is built entirely in-house — not outsourced or mass-produced. From CNC machining to welding and quality control, we oversee every step to ensure your manifold meets the highest standards of fit, finish, and performance. This is the same design trusted on record-setting builds and proven under extreme conditions, both on the street and at the track. When you choose RK, you’re choosing uncompromising quality, real-world performance, and a brand that backs it up.

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