The B7 Audi RS 4 is easy to romanticize, but it is more useful to start with what it actually is: a compact performance sedan built around a naturally aspirated 4.2-litre V8, a 6-speed manual gearbox, and quattro all-wheel drive.
That combination is the reason the car still attracts serious attention. It is not the quickest RS model by modern standards, and it is not cheap to keep right, but it has a layout Audi no longer sells in this form. A good RS 4 B7 feels deliberate, mechanical, and dense with character.
The important word is good. These cars are old enough now that condition matters more than the headline specification.
Core Specifications
| Detail | Figure |
|---|---|
| Engine | 4.2 FSI V8, BNS |
| Displacement | 4,163 cc |
| Power | 420 PS |
| Torque | 430 Nm |
| Redline | 8,000 rpm |
| Transmission | 6-speed manual |
| Drivetrain | quattro AWD |
| 0-100 km/h | 4.8 seconds |
| Curb weight | approx. 1,650 kg |
The numbers explain the outline, but not the appeal. The RS 4 is defined by the way it asks to be driven. The V8 does not rely on a low-rpm turbo surge. It builds power as the revs rise, and the manual gearbox keeps the driver involved in that process.
Why the B7 Still Feels Distinct
Many newer performance sedans are faster in a straight line. Some are easier to drive quickly. The RS 4 B7 is interesting because its speed is tied to interaction.
You work the gearbox. You let the engine climb. You feel the front-heavy layout and quattro system decide how the car takes a corner. It is not a delicate lightweight sedan, but it is not numb either. The chassis rewards smooth inputs and punishes lazy ones.
The wide-body shell is another part of the appeal. It looks different from a normal A4 without turning into a caricature. The arches, stance, brakes, and exhausts give the car presence, while the basic sedan shape keeps it usable.
Engine Checks Matter
The 4.2 FSI V8 is the reason most people want the car, so it should be inspected with more care than the paint color or wheel choice.
Direct injection can lead to intake carbon buildup. A car that feels flat, hesitates, or does not pull cleanly at higher rpm may need attention. Listen for chain-related noise, check for oil leaks, confirm clean idle behavior, and make sure service records show regular, correct maintenance rather than vague promises.
The engine should feel crisp through the rev range. It does not need to be brutal at low rpm, but it should not feel lazy, rough, or reluctant to rev.
Drivetrain and Chassis
The quattro system uses a rear-biased 40:60 nominal torque split, which gives the RS 4 a more balanced feel than some older Audi stereotypes suggest. It is still a heavy front-engined car, so it works best when the driver is patient with weight transfer.
Check the clutch, gearbox synchros, drivetrain mounts, differential noise, tire wear, and alignment. A car that has been used hard can still be a good buy if it has been maintained properly. A car that has been neglected will usually show it in the way it shifts, brakes, and settles over bumps.
Dynamic Ride Control also deserves attention. Uneven ride height, knocking, poor body control, or an unsettled feel can point to suspension problems. Many cars have been repaired, refreshed, or converted over the years, so verify what is actually fitted.
Brakes, Tires, and Running Costs
The RS 4 is not a normal A4 to run. Brakes, tires, suspension parts, and RS-specific trim can be expensive. That does not make the car unreasonable, but it does mean a cheap example can become expensive quickly.
Look for matching quality tires, healthy brake discs, even pad wear, clean fluid history, and evidence that the owner bought the correct parts instead of the cheapest ones that fit. The best examples usually feel expensive before you even open the service folder.
What a Strong Example Feels Like
A good RS 4 B7 should feel tight, consistent, and eager. The steering should track cleanly. The gearbox should feel direct. The engine should pull smoothly and gain urgency toward the top end. The brakes should feel strong, not tired.
Mileage alone is not enough. A higher-mile car with specialist maintenance can be better than a low-mile car that has sat, skipped work, or collected cosmetic upgrades instead of mechanical care.
Verdict
The Audi RS 4 B7 remains desirable because its formula is specific and increasingly rare. It is a compact sedan with a naturally aspirated V8, a manual gearbox, quattro traction, and a body that still looks disciplined years later.
Buy one for the engine, the layout, and the feel. Inspect one for carbon buildup, suspension condition, drivetrain health, brakes, tires, and evidence of proper ownership. The right car is still special. The wrong one can make the specification feel much less romantic.
