With its massively flared fenders, low front splitter, large vent on the hood and top-mounted rear wing, the Audi RS 3 LMS is reminiscent of a DTM race car shortly after the turn of the millennium – albeit being much more akin to the production model. The steel body has been adopted from the production version nearly unchanged. For use in racing, the body produced at the Győr plant was only made lighter, reinforced in some areas, and provided with a steel-tube safety cage for maximum protection of the driver.

The sequential six-speed racing transmission of the Audi RS 3 LMS has a proven track record in other race cars of the Group, as does the multi-plate limited slip differential.

To keep costs low, driving aids are prohibited in the TCR category. That is why the Audi RS 3 LMS neither uses an anti-lock braking system (ABS) nor traction control (ASR) or an active differential.

In the development project, Audi attached particular importance to safety, in terms of which the Audi RS 3 LMS sets new standards. The extensive safety package includes an FIA-conformant safety fuel tank, a safety cell for racing, the PS3 safety seat, FIA safety nets on both sides of the seat and a rescue hatch in the roof like the one used in the Audi R8 LMS.