NASCAR quietly made key rules tweak that could alter Toyota advantage

NASCAR made a relatively quiet rule change that fans say could affect Toyota’s performance in the Cup Series. Toyota has been the most dominant manufacturer this season, and after legal chatter around 23XI Racing’s case against NASCAR, the discussion has largely centered on normal competitive cycles plus Chevy’s struggles and body updates. The spark came from a comment by Mamba Smith during Kevin Harvick’s Happy Hour, suggesting a “little adjustment” on Penske’s nose and splitter could help downforce. Bob Pockrass clarified on Twitter that Toyota identified a splitter flex, so all teams starting with North Wilkesboro had to add struts to prevent movement or deformation at speed. Through two races after the change—North Wilkesboro and Indianapolis—Toyota kept strong results, including four top-6 finishes at Wilkesboro and multiple top runs at Indy. Brad Keselowski called it a big deal, while the article notes the real test likely comes at mile-and-a-half tracks next.