- The attached `Carfax` vehicle history report shows that this Audi has been registered mostly in California since new. - According to the build sheet provided in the gallery, notable factory equipment includes a power sunroof, Valcona leather upholstery, carbon fiber inlays, heated and power-adjustable front sport seats, and a Bose sound system. - Notable modifications reported by the seller are extensive, and the full list is detailed below.
Highlights include ported heads, JE pistons, an e85 tune, Wagner Tuning intercoolers, 19-inch aftermarket wheels, Bilstein PSS9 coilovers, and a custom sound system. - The C5-generation RS6 debuted for the 2003 model year as Audi’s flagship performance sedan, designed to rival the BMW M5 and Mercedes-Benz E55 AMG. It was the first RS6 offered in the United States and featured distinctive styling cues, advanced technology, and a powerful twin-turbocharged engine.
The C5 RS6 is notable among enthusiasts for introducing Audi's performance RS formula to a broader market. - Power comes from a 4.2-liter twin-turbocharged V8, rated at 450 horsepower and 415 lb-ft of torque in stock form. The seller estimates that this RS6 currently produces approximately 650 horsepower due to the modifications, but a dyno sheet was not provided to confirm.
Output is sent to all four wheels via a 6-speed manual transmission. | - The attached `Carfax` report notes a possible odometer rollback occurring in March 2018 and a mile inconsistency November 2020. As a result, this Audi is listed as True Mileage Unknown or TMU; its odometer currently displays 170,300 miles.
- The attached `Carfax` history report indicates that this Audi sustained unspecified "minor damage" in February 2026. The seller notes the Audi was backed into and the rear wheel was a replaced as a result. In December 2021 the Audi sustained "minor damage" to the front, right front, and left front.
No additional details are provided. - 2019 date code on tires - Some wear on seats and on interior surfaces | The seller reports the engine was rebuilt, and the oil pump, timing belt tensioners, gaskets, oil cooler, and water pump were replaced during their ownership. Extensive photos of the rebuild and upgrade process are viewable in the "Other" section of the photo gallery.
Some additional service history is detailed in the attached `Carfax` history report. | - 2 keys - 1 spare matching wheel - Interior trim kit - Spacer parts | A build sheet is provided in the photo gallery, and a partial list of notable equipment reported by the seller includes: - Power sunroof - Valcona leather upholstery - Carbon fiber inlays - Heated and power-adjustable front sport seats - Automatic climate control - Bose sound system | Notable modifications reported by the seller include: **Transmission:** - Audi 01E 6-speed manual transmission swap - Rene Rumler transmission plate and adapter - Clutch Masters twin-disc clutch **Engine:** - Ported heads - Supertech Performance springs and retainers - JE Pistons 9:5 - FCP Engineering rods - Millennium Technologies nikasil plating on rods and pistons - ACL Race Series rod bearings - Mahle head gasket kit - JHM Motorsports shifter linkage and bushings - Forge diverter valves - TTE Global tte650 turbo cat-less down pipes - 1200cc injectors - Hellcat fuel pump - e85 tune - Wagner Tuning intercoolers - Custom ported intake manifold - Aftermarket air intake with spacer - 76mm MAF **Wheels, Brakes, and Suspension:** - 19-inch aftermarket wheels - Yellow brake calipers - Bilstein PSS9 coilovers **Interior:** - Aftermarket head unit - Aftermarket custom sound system - AEM Electronics boost and wide band gauges - R8 shift knob | The seller reports that they purchased this Audi in January 2022 and have added approximately 6,000 miles since. | - Due to the modifications performed to this Audi, it may not pass emissions testing in some states.
As always, it's the **buyer's responsibility** to perform all due diligence regarding registering this Audi in their respective state **prior to placing a bid. ** - The seller reports that the front end of this Audi was previously repainted due to chips, paint protection film has been applied to the front end, and that the windows have been tinted.