MuchBoost 4.2FSI hybrid turbo set, Audi RS6 C5 4.2L (660 hp)

MuchBoost 4.2FSI hybrid turbo set, Audi RS6 C5 4.2L, 660 hp

A bolt-on MuchBoost hybrid turbo set for applications including Audi RS6 C5 4.2L. This upgrade is built for 4.2FSI applications and retains a clean, vehicle-specific installation.

The turbo is based on original BorgWarner housings. The upgraded compressor and higher-flow turbine sides provide considerably more capacity than the factory unit, while the housings are precision-machined for the new internals.

Depending on the selected version, the manufacturer rates the turbo for approximately 660 hp. Final output depends on engine condition, the fuel system, intake, exhaust, cooling and, above all, the ECU calibration.

An upgraded turbo always requires vehicle-specific ECU calibration.

Futurez imports MuchBoost turbochargers and works with the manufacturer in Finland. You get secure delivery from a Finnish seller, a wide choice of payment methods and help selecting the correct turbo version. Every purchase also earns F* Bonus points.

Technical features

• Manufacturer-rated power potential approximately 660 hp
• Upgraded billet compressor wheel
• Larger high-flow 9-blade turbine wheel
• Reinforced journal bearing system for higher boost
• Precision-machined compressor housing and seal plate
• Precision-machined turbine housing
• Turbo core is high-speed VSR balanced
• Reinforced wastegate actuator

• Original BorgWarner housings and actuator
• Compressor and turbine wheels are balanced separately, followed by high-speed VSR balancing of the complete core
• Required gasket set is included
• Bolt-on fit in place of the original turbos

Upgrade service or a complete new turbo?

You can order the turbo either by sending your original unit to us as the build core or by choosing a complete, newly built turbo.

Send my original turbo: The serviceable original housings are used to build the new hybrid turbo. After ordering, we will email the return instructions so the turbo can be sent through us for the upgrade. The work and delivery normally take around 2–3 weeks from the time the turbo arrives for inspection. The supplied unit must be original and its housings must be serviceable.

Complete new turbo: You receive a complete, ready-built hybrid turbo. Your original unit does not need to be sent in, so it can be retained or sold separately.

Read more about the core exchange process and shipping instructions.

Examples of compatible vehicle applications

• Audi RS6 C5 4.2L 450-480HP (MY 2002–2004)

Related OE and turbo numbers

5304
0028
0029
077145703P
077145703PX
077145703PV
077145704K
077145704KX
077145704KV

Before ordering, check the engine code and the identification numbers on the original turbo. If you are unsure about fitment, contact us with the VIN and the old turbo numbers and we will help verify the correct version.

Tip: Ask us for the gaskets, bolts, oil lines and other installation parts at the same time. A new turbo should not be installed with a restricted oil feed or leaking gaskets.

MuchBoost turbochargers carry a 12-month manufacturer warranty covering manufacturing and material defects. The warranty does not cover failures caused by external factors such as lubrication problems, unsuitable engine calibration or installation errors.