Built, tuned, and boosted — this Stage 2 Audi S4 by REVO puts out a brutal 500hp, and it begs the question: why pay more for an RS4? In Part 1 of this series: Full REVO Stage 2 build overview Turbo, ...

Audi seems to have created something special in the current generation S4. To the layman, having two less cylinders than the previous generation’s naturally-aspirated V8 could be seen as a backward ...

It's a battle of Audi beasts! In this 3-way drag race, we pit a factory Audi RS4 against a tuned REVO Stage 2 Audi S4, and a completely stock S4. Which one truly delivers on the strip? In this race ...

Diesel's low-rev response, some fussy facelift styling details Understated almost to the point of anonymity, the S4 is the mid-level performance version of the Audi A4 saloon that’s seen more heart ...