NR2003 simulated the 2003 NASCAR Winston Cup season. The game featured 42 of the Winston Cup teams anticipated to run that year — with the exception of Chip Ganassi Racing — and 23 series tracks. Notable among the included drivers was Dave Blaney, who was absent from EA Sports' competing NASCAR Thunder 2004. Players could engage in testing sessions, single-event races, a full championship mode, and multiplayer. Car setup was adjustable throughout. In May 2003 Papyrus released a free downloadable content pack containing three fictional tracks.
The physics engine was a central selling point. It was refined and enhanced under direct consultation with NASCAR team engineers, producing a level of simulation fidelity that press and community reviewers singled out as a departure from earlier console-oriented racing games. The result was a title aimed squarely at the hardcore sim-racing segment of the market.
The end of NR2003's commercial life was abrupt. At the end of March 2004, Electronic Arts secured an exclusive agreement with NASCAR that locked competing publishers — and therefore Papyrus — out of the license. NR2003 was pulled from retail shelves at that point. In May 2004, Sierra's parent structure shut Papyrus down entirely.
David Kaemmer, one of the co-founders of Papyrus and a central architect of the studio's simulation technology, then purchased the NR2003 source code and assets from the successor entity for his newly formed company FIRST, LLC. That codebase became the direct technical basis for iRacing, the subscription-based online racing simulation service Kaemmer launched in 2008. In 2007, Sierra shut down the online multiplayer servers that had supported the game.
The EA exclusive license that effectively killed NR2003 ran from 2004 to 2009. After its expiry, NASCAR racing rights returned to the broader market when Activision Blizzard — successor to Sierra's parent company — reacquired the rights in 2011 for NASCAR The Game: 2011.
NR2003 received generally favourable critical reviews according to the review aggregation website Metacritic. PC Gamer US awarded it its 2003 Best Racing Game prize, with reviewer Andy Mahood writing that the game had "established a daunting new standard for PC racing simulations that may take years to eclipse." The commercial performance was respectable though not dominant in its genre: US sales reached at least 100,000 units, below the 260,000 US sales achieved by NASCAR Racing 4. Total US sales across all NASCAR Racing computer games released in the 2000s reached 900,000 units by August 2006.
NR2003's most durable legacy is institutional rather than commercial. The simulator was treated by dedicated communities as a platform rather than a product — modified, extended, and kept online by fans long after official support ended. Its successor, iRacing, became the dominant professional and semi-professional online racing simulation service, making the NR2003 codebase one of the most consequential in sim-racing history.