RS 4

Audi built the RS 4 (B7) from 2005–2008. The B7 RS 4 brought Audi’s high-revving naturally aspirated V8 and rear-biased quattro calibration to a compact saloon. Its four-door saloon form and high-performance saloon purpose locate it within a specific chapter of the marque’s performance history.

This record covers the B7 RS 4 saloon, excluding the Avant and Cabriolet body styles and the earlier twin-turbo B5. That scope is important: familiar badges can cover several engines, markets and model years, while road cars and competition derivatives may share a name without sharing a usable technical specification.

The mechanical centre is the BNS, a 4,163 cc naturally aspirated v8. The period specification represented here is 309 kW (420 PS) and 430 Nm. Those figures stay attached to this configuration rather than blending regional tunes or later revisions.

The direct-injection 4.2-litre V8 revs to 8,250 rpm and works with a six-speed manual and rear-biased 40:60 quattro centre differential. The installation is longitudinal front engine, all-wheel drive, working through a 6-speed manual. That combination determines throttle response, traction and the path by which induction, combustion and transmission sound reach the cabin and roadside.

Useful listening markers include high-revving FSI V8, six-speed manual, rear-biased quattro, four-door cabin. A genuine cold start records cranking, first combustion and the transition to a settled idle; a warm restart is a different event and should be labelled as such.

Under acceleration, microphone position and engine load reveal different layers. An engine-bay or cabin recording can expose induction and valvetrain detail, while an exterior pass gives more weight to exhaust, tyres, turbocharger or supercharger behaviour and the acoustic effect of speed.

The B7 identity also makes comparisons within the RS 4 lineage family meaningful. Closely related editions may differ in intake hardware, boost control, gearing, catalysts, silencers or mass, so their recordings should not be treated as interchangeable merely because the body shell looks similar.

Surviving examples frequently carry replacement exhausts, wheels, suspension or engine parts. Those cars can still make valuable contributions when the changes are documented; the archive simply needs to distinguish a modified survivor from an evidenced factory-stock reference.

The 2005–2008 production period supplies another boundary for research. Manufacturers revised emissions calibrations, equipment and market availability during model runs, and historic output may appear in PS, kilowatts or regional horsepower standards. Keeping units and market context visible prevents false precision.

Body layout matters to sound as much as specification sheets suggest. The four-door saloon changes cabin volume, resonance and the listener’s distance from the powertrain. Engine position, driveline and body openings can therefore make related engines feel substantially different in use.

Period photographs establish design and historical context, but appearance alone cannot prove untouched mechanical condition. Originality should be described component by component, especially for intake, forced induction, catalysts, silencers, transmission and final-drive hardware that can alter performance and sound. Service records and dated photographs can make those distinctions clearer without asking readers to accept appearance as proof.

The RS 4 is therefore best understood as a connected mechanical identity: BNS, 6-speed manual, all-wheel drive and the B7 boundary. Preserving those elements gives readers a useful story now and gives future community recordings an exact historical home.