The Studiotorino RUF RK Spyder, shown in 2005, was a heavily modified version of the Porsche Boxster styled by Studiotorino and tuned by RUF. It used a supercharged 3.8-liter engine producing around 434 bhp, giving the small roadster serious supercar-level performance. Only 49 were built, making it very rare.

In the mid-2000s, Volvo offered the XC90 with a DOHC 32-valve V8 engine developed by Yamaha. In 2005, Volvo showed a supercharged version of the XC90 V8 at the Los Angeles Auto Show, hinting at a higher-performance model. That supercharged version was never sold to the public. The standard XC90 V8 remained on sale for a few years before the V8 option was discontinued in 2011.

The Mercury Meta One concept, shown in 2005, was a luxury crossover that previewed a diesel-hybrid powertrain. It was meant to signal a new direction for Mercury, blending upscale design with more efficient tech. The car never made it to production, and the Mercury brand was later discontinued before anything like it reached showrooms.