CFD-optimized turbo inlet for BMW B57R engines.

Designed for more efficient airflow, reduced pressure loss, and the most uniform flow possible into the turbocharger.

• Reduced pressure loss (40%) compared to the OEM geometry
• Optimized fluid volume (20%) for more efficient airflow
• CFD-optimized flow path
• More uniform flow into the turbocharger
• Vehicle-specific design for OE 13718596434
• High-strength PA12 plastic
• Developed using 3D scanning, CAD, and CFD

Your advantage

The turbo inlet forms the transition between the intake tract and the turbocharger. It is precisely at this point that the geometry determines how efficiently the intake air is guided to the compressor.

The RevDop turbo inlet was therefore not simply enlarged, but specifically designed for more efficient flow guidance.

Less flow loss. More efficient airflow.

The OEM geometry of the B57R was analyzed and then compared with a newly developed RevDop design.

In doing so, we look not only at the cross-section, but at the entire flow path:

Pressure loss · Fluid volume · Flow velocity · Flow homogeneity

The goal is to guide the air to the turbocharger with as little loss and as uniformly as possible.

This is exactly where the RevDop turbo inlet comes in.

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CFD instead of gut feeling

At RevDop, performance components are not created based on the principle that "bigger must be better."

Development follows a clear engineering process:

3D Scan

The original geometry and installation situation are precisely recorded.

CAD Design

The optimized RevDop design is created based on the OEM geometry.

CFD Simulation

OEM and RevDop are directly compared. We examine, among other things, pressure loss, fluid volume, and flow distribution.

Prototype

The optimized geometry is manufactured as a functional prototype and tuned to the real vehicle application.

Test

Only the combination of simulation and practical testing turns a CAD geometry into a finished RevDop product.

We don't develop based on gut feeling. We develop based on data.

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Specially developed for the B57R version

Even if several BMW models use the same B57R engine, this does not automatically mean that every version of the air ducting is identical.

This is precisely why this turbo inlet is based on OEM part number 13718596434.

This is particularly important for the upper connection areas of the inlet. The current design was therefore newly laid out specifically for the vehicle, rather than simply transferring another B57 inlet geometry.

The OEM part number 13718596434 is used for the M340d, M440d/440d, and ALPINA D3 S, among others.

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Compatible with

BMW

3 Series G20

• M340d xDrive

3 Series G21

• M340d xDrive Touring

4 Series G22

• M440d xDrive Coupé

4 Series G23

• M440d xDrive Convertible

4 Series G26

• 440d xDrive Gran Coupé

BMW ALPINA

G20

• D3 S

G21

• D3 S Touring

The OE part number 13718596434 is documented for these applications as a "Filtered Air Pipe".

Important: We recommend checking the installed OEM part number before ordering.

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OE Reference

BMW OEM: 13718596434

The number is listed in the BMW parts catalog as "Filtered air pipe".

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High-quality PA12 manufacturing

The turbo inlet is manufactured using an industrial 3D printing process from high-quality PA12 polyamide. The material enables a high-density, flow-optimized internal geometry while simultaneously offering high dimensional stability for use in the engine compartment. The temperature resistance is 180 degrees, and the polyamide is highly resistant to gasoline, oil, and chemicals.

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RevDop Engineering

We develop performance components for modern BMW and VAG engines with a clear focus on flow optimization and technical efficiency.

Our products are created not from the idea of looking as spectacular as possible, but from the analysis of the actual geometry and flow conditions.

Scan. Design. Simulation. Test.

Engineering instead of hype.

Scope of delivery

• 1x BMW B57 High-Flow Turbo Inlet

Delivery time

Our products are generally ready for shipment within 2–3 working days, provided they are in stock.

If an item is not available due to high demand or supply bottlenecks, it will be manufactured using our high-quality PA12 3D printing process. In this case, the delivery time is up to 3 weeks.

Important assembly note

When installing, it is recommended to work with a lifting platform, as the retaining clip on the turbo inlet must be released from below on some models.

Legal notice

This product does not have an ABE, a parts certificate, or a type approval.

It is not approved for use in public road traffic within the scope of the StVZO (German Road Traffic Licensing Regulations). Use is exclusively for motorsport purposes, export vehicles, or outside of public roads.

Installation of this product may lead to the expiration of the operating permit according to §19 StVZO.

A possible individual acceptance according to §21 StVZO must be clarified in advance under your own responsibility with a testing organization.

This is not an original part from BMW AG, BMW M GmbH, or Bovensieben Automobile GmbH + Co KG. The mentioned brand and model names are used exclusively for clear product assignment.