Vehicle Description

This 2005 Audi S4 Cabriolet combines Audi’s naturally aspirated 4.2-liter V8, Quattro all-wheel drive, and open-top driving in one of the most distinctive performance Audis of the era.

This particular S4 has received an extensive amount of recent mechanical service, preventative maintenance, and restoration work, including major engine, cooling, suspension, drivetrain, fuel-system, electrical, exhaust, and convertible-top work.

Rather than simply addressing one or two items before sale, considerable attention has been given to refreshing the vehicle and correcting many of the age-related maintenance items commonly found on the B6 S4 platform.

4.2L V8 Performance

Under the hood is Audi’s naturally aspirated 4.2L V8, producing approximately 340 horsepower from the factory. Combined with Audi’s legendary Quattro all-wheel-drive system, the S4 delivers immediate naturally aspirated throttle response, strong V8 power, and confident all-season traction.

The factory downpipes have also been removed and replaced with performance downpipes, giving the 4.2L V8 a much more aggressive exhaust note.

Extensive Recent Engine, Cooling & Electrical Service

A substantial amount of recent mechanical work has been completed, including:

• New alternator
• New fuel pump
• Both oil cooler gaskets replaced
• Accessory/serpentine belt replaced
• Belt tensioner replaced
• Idler pulley replaced
• Starter replaced
• Auxiliary radiator replaced
• Fuel filter replaced
• Fresh engine oil service performed

These are meaningful maintenance items on a B6 S4 and represent a significant amount of recent mechanical investment.

034Motorsport Engine & Transmission Mounts

The drivetrain mounting system has also been upgraded with 034Motorsport components, helping reduce excessive drivetrain movement and providing a tighter, more responsive feel.

• 034Motorsport engine mounts — both sides
• 034Motorsport transmission mounts — both sides
• 034Motorsport front snub mount

Transmission & Quattro Drivetrain Service

The automatic transmission and drivetrain have received comprehensive recent servicing:

• Automatic transmission fluid service
• Transmission filter replaced
• Transmission pan gasket replaced
• Rear differential fluid serviced

This work provides fresh fluids and serviceable components throughout important areas of the drivetrain.

Major Front Suspension Refresh

The front suspension has undergone an extensive refresh using high-density suspension components rather than replacing only one or two worn pieces.

Recent suspension work includes:

• Front lower forward control arms with high-density bushings
• Front lower rearward control arms with high-density bushings
• Front upper forward control arms with high-density bushings
• Front upper rearward control arms with high-density bushings
• Front sway-bar end links with high-density bushings
• Front outer tie rods
• Front-end alignment performed after suspension installation

This addresses the major front control-arm, bushing, and steering wear components together and gives the front end a much tighter and more composed feel.

Convertible Top

The convertible system has also received significant attention.

• New soft top installed
• Convertible-top mechanism serviced and repaired
• Power convertible top functioning properly

A replacement soft top is a substantial improvement on an S4 Cabriolet of this age and greatly improves both the appearance and usability of the vehicle.

Exhaust

The restrictive factory downpipes have been removed and replaced with performance downpipes, allowing the naturally aspirated 4.2L V8 to produce a deeper and much more aggressive exhaust note.

Extensively Serviced & Ready to Enjoy

The B6-generation S4 Cabriolet offers a combination that simply isn’t common anymore: a naturally aspirated V8, Quattro AWD, premium German interior, performance-oriented chassis, and power convertible top.

This example has received substantial recent investment where it matters, including a new alternator, new fuel pump, cooling-system work, oil cooler gaskets, starter, belt drive components, 034Motorsport engine and transmission mounts, transmission service, differential service, fuel-system service, major front suspension overhaul, alignment, performance downpipes, and a new convertible soft top.

For someone looking for a B6 S4 Cabriolet, much of the expensive maintenance and age-related work that typically needs attention on these cars has already been addressed.

With the top down and the naturally aspirated 4.2L V8 providing the soundtrack, this S4 delivers the character and driving experience that made this generation of Audi performance cars special.