Find of the Day: Stock Look, Supercar Punch From This 600-HP B5 Audi S4

A standard B5 Audi S4 with a 2.7-liter twin-turbo V6 and a 6-speed manual transmission is already a standout. But this is more than a standard B5 Audi S4. About two and a half times more to be exact. This 2000 Audi S4 Sedan is boasting a reported 600 horsepower and is up for auction now on Cars & Bids. Can you handle it?

The modifications here read like a greatest-hits list for B5 enthusiasts. Upgraded with RS4 components, massive TiAL 770 turbochargers, built internals, and fueling upgrades that include Bosch 1300cc injectors and even a fuel pump from a Dodge Hellcat, this S4 is clearly built for serious power. The auction listing claims 600 horsepower at the wheels, a figure that, if accurate, transforms this once-modest sedan into something capable of embarrassing far newer and more expensive performance cars.

Additional Mods and Issues

Of course, it’s not just about straight-line speed. Supporting mods like Bilstein PSS9 coilovers, Brembo brakes, and lightweight BBS CH wheels ensure this car has the handling and stopping power to match its output. Inside, subtle upgrades like an Alcantara headliner and modern audio components add a touch of refinement without straying too far from the car’s original character.

That said, this isn’t a turnkey, showroom-perfect example. The Carfax is clean in terms of mileage, but it does note past incidents, and the car presents with typical wear along with a list of mechanical needs. Items like clutch chatter, fluid leaks, and worn suspension components mean the next owner should come in prepared, this is very much an enthusiast’s car, not a casual daily driver.

But that’s part of the appeal. Cars like this aren’t about perfection, they’re about potential. For the right buyer, this heavily modified S4 represents an opportunity to own a truly ferocious, analog performance sedan that still flies under the radar. Bidding ends Monday, May 11.

View the Cars & Bids listing here.