Audi RS2 Porsche Parts: The Ultimate Guide to Shared Components

The Audi RS2 Avant is a unique piece of automotive history, born from a collaboration between Audi and Porsche. Produced from 1994 to 1995, this high-performance wagon combined Audi's all-wheel-drive chassis with Porsche's engineering expertise. Many components under the skin were sourced directly from Porsche, making the RS2 a parts-bin special that shares DNA with models like the 964 and 993. If you own an RS2 or are considering one, understanding which parts are interchangeable with Porsche models is essential for maintenance, restoration, or performance upgrades.

Porsche Parts Found on the Audi RS2

The RS2 was developed at a time when Porsche was deeply involved with Audi's Quattro GmbH. The result is a vehicle that uses a surprising number of Porsche-specific parts. Here’s a breakdown of the key shared components.

Engine and Turbocharging System

The RS2’s 2.2-liter 5-cylinder turbo engine (AAN code) features a turbocharger sourced from Porsche. The KKK K24 turbo is the same unit used on the Porsche 964 Turbo. Additionally, the wastegate, intercooler, and boost pipes were designed with Porsche’s input. If you need to replace the turbo, a genuine Porsche 964 K24 unit is a direct fit. The intake manifold and camshafts also carry Porsche part numbers, though they are specific to the RS2.

Brakes and Suspension

Porsche supplied the braking system for the RS2. The front calipers are four-piston monobloc units from the Porsche 964 Turbo, with 304mm cross-drilled rotors. The rear calipers are also Porsche items, though they differ slightly from standard 964 parts. For replacement rotors or pads, you can order Porsche 964 Turbo parts, but double-check the mounting dimensions. The suspension uses custom components, but the front strut bearings and control arm bushings are shared with the 968 and 944 Turbo. Coilovers from Porsche 964 or 993 models can be adapted with minor modifications.

Wheels and Tires

The RS2 came standard with 17-inch Cup wheels, which were actually Porsche 968 Club Sport wheels with a specific offset and Audi center bore. These wheels are still available through Porsche Classic or aftermarket replicas. Tire sizes are the same as the Porsche 968 (225/45R17 front, 245/40R17 rear). If you want to upgrade to larger wheels, know that Porsche 993 Turbo and 996 Turbo wheels have similar offsets but may require hub adapters.

Interior and Electronic Components

While the interior looks distinctly Audi, several switchgear items and gauges are shared with Porsche. The climate control unit, headlight switch, and window regulators are cross-referenced with the Porsche 968. The boost gauge in the instrument cluster is a unique RS2 piece, but the cluster itself uses Porsche-sourced connectors. If restoring the interior, many trim pieces are Audi 80 B4 exclusive, but the leather shift boot and handbrake cover match the 964 pattern.

Where to Find OEM and Aftermarket RS2 Parts

Sourcing parts for a rare 30-year-old car can be challenging, but the RS2’s Porsche connection expands your options. Focus on specialized suppliers rather than general marketplaces.

Audi Specialists and Porsche Classic

Many Audi parts suppliers have list of RS2 components, but often at a premium. For engine and brake parts, contact a Porsche Classic dealer – they can order 964 or 993 parts that cross-reference directly. For example, the wastegate diaphragm is still available from Porsche under the 964 part number.

Aftermarket Performance Brands

Companies like 034Motorsport, Wagner Tuning, and H&R offer RS2-specific upgrades. If you want a higher-flow turbo, consider a hybrid K24 unit from a Porsche performance shop. For suspension, Bilstein and KW make coilovers for the 80/90 platform that fit the RS2, but you’ll need to specify the RS2’s spring rates.

Salvage and Used Parts

Because the RS2 shares mechanicals with the 964 and 993, you can often find used parts from those cars at lower prices. Look for donor 964 Turbos for brake calipers, or 968 for wheel sets and suspension. Be aware that some parts like the intercooler and exhaust manifold are RS2-specific, so verify fitment before buying.

Compatibility with Other Porsche Models

The RS2’s Porsche parts mainly come from models built between 1989 and 1998. Here’s a quick compatibility guide:

• Turbo and boost components: 964 Turbo (1989-1994) – nearly identical.
• Brakes: 964 Turbo (front calipers and rotors); 968 (rear calipers with adapters).
• Suspension: 944 Turbo and 968 struts can be used with custom top mounts.
• Wheels: 968 Club Sport and 993 Turbo wheels (with hub rings).
• Engine internal parts: Some valve train pieces from 968 (albeit 4-cylinder) may fit valve guides but not pistons.

Note that the RS2’s engine is a 5-cylinder, so while the turbo system is 964-based, the long block and core components are Audi 80/90 S2 specific. Do not assume whole engine interchangeability.

Tips for Sourcing Authentic Parts

When buying Porsche parts for your RS2, follow these practical guidelines:

• Cross-reference part numbers: Use diagrams from Audi parts catalogs and compare to Porsche PET for 964/993. Many items have both Audi and Porsche numbers.
• Check condition of used parts: Turbos from 964s may have high mileage; consider a rebuild or hybrid upgrade.
• Use Porsche VIN for ordering: When buying from a Porsche dealer, provide the 964 VIN (e.g., 964 something) to ensure correct part. They may not accept an Audi VIN.
• Beware of pattern parts: Some aftermarket companies sell “RS2 compatible” parts that are actually generic. Stick with known brands like Sachs, Lemförder, and Bosch for reliability.
• Consider upgrading instead of restoring: The RS2 is a great candidate for modern brake kits (e.g., 996 calipers) or coilover suspension. Many parts are direct bolt-on.

Recommendation

Maintaining an Audi RS2 doesn’t have to be a nightmare if you embrace its Porsche heritage. For critical components like turbochargers, brake calipers, and wheel bearings, buying genuine Porsche parts from 964/993 models is often cheaper and easier than hunting for rare Audi RS2 items. For suspension and interior, look toward the 968 or 944 Turbo for economical alternatives. Always verify fitment with a specialist before purchasing, and when in doubt, contact a dedicated RS2 forum or shop. By leveraging the RS2’s Porsche parts bin, you can keep your Avant running strong for years to come.