According to Auto Express, Audi has revealed that the new RS4 and the following RS5 Coupe could feature a 3.0-liter V6 engine with an electric turbocharger. The setup would allow the vehicles to create a massive amount of horsepower without any lag while achieving better fuel economy. Sounds like the perfect engine, right? The complicated system is powered by batteries, which are charged through a generator that regains lost energy through braking.

There is one major drawback to an electric turbocharger: cost. The electrical system is much more expensive than the traditional method of diminishing turbo lag and will only be found on Audi's top-end models. An electric turbocharger would help the RS4 and RS5 keep pace with the Mercedes C63 AMG and may also find its way into the new R8. Rumor has it that the new RS models will have over 480 hp, which is 30 hp more than the current model, but roughly 20 hp less than the C63 AMG. The rivalry between the RS4/RS5 and C63 AMG will be closer than ever, but we're worried about the lack of horsepower in the R8 if it were to get the same engine.