Audi OEM Bw KO4SWA

Fitment and Compatibility

This is a Borg Warner K04 turbocharger (model KO4SWA) for Audi applications. Confirm your specific engine code and whether your car is already K04-equipped or you’re upgrading from a K03 before ordering, since K04 turbo swaps sometimes require supporting modifications like fuel system upgrades.

Part Overview

The K04 is a well-known upgrade turbocharger in the Audi/VW tuning scene, larger than the factory K03 found on many base turbocharged models, giving increased boost potential for buyers looking for a performance upgrade.

Condition and What’s Included

Inspected for shaft play, housing condition, and wastegate function before listing — turbocharger condition assessment is more involved than most parts given the moving components inside.

Installation Notes

Turbo swaps are a significant engine bay job — this is typically a shop-level installation given the precision required for turbo mounting, oil and coolant line connections, and potential supporting modifications like a larger fuel injector or upgraded intercooler depending on your power goals.

OEM vs Aftermarket

This is a genuine Borg Warner unit rather than a budget reproduction turbo — Borg Warner is one of the most trusted names in this space, and genuine units hold their reliability and boost characteristics better than off-brand alternatives.

Shipping and Support

Ships boxed with protection for the turbine housing and connections.

Warranty and Returns

Covered under our 30-day return window for shaft play and function as described.

Why Buy This From Us

We check shaft play and wastegate function specifically before listing, since these are the two most common failure points on a used turbo that aren’t visible from the outside.