AI-rewritten: This is a summary of an article from Ars Technica, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story.

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Sportscar racing is experiencing a surge in popularity, driven by better fan access and the ability to stream multi-hour events like IMSA’s WeatherTech Sportscar Championship. The series audience grew significantly last year, with domestic viewership increasing by over 33% and international growth of nearly 25%. While weather recently complicated the 2026 Petit Le Mans finale at Road Atlanta, resulting in neutralized periods and limited cautions, Porsche drivers secured a historic victory using their first prototype win at this specific event.

Despite recent successes, factory support for prototype racing is facing challenges due to economic pressures and geopolitical disruptions. Porsche reduced its factory program by half last year, citing the impact of tariffs and an unmet electric vehicle transition plan. Similarly, Alpine is retiring from the World Endurance Championship, and Acura is ending its IMSA GTP program to focus on IndyCar. However, new entrants like Genesis, Ford, and McLaren are joining the World Endurance Championship, suggesting a positive trajectory for the sport.

A key factor in this evolution is the shift toward unified technical regulations starting in 2030. Most manufacturers currently use IMSA’s LMDh ruleset rather than the World Endurance Championship’s Hypercar category, which allows for greater technical freedom but higher costs. IMSA President John Doonan emphasizes that rule stability is critical for longevity and marketability, noting that a single set of regulations would have been ideal from the start. Industry leaders agree that moving to one unified category will help automakers and sponsors navigate future economic headwinds more effectively.