As both the current and old-spec Porsche reach new weight heights, the BoP remains secondary in the often-chaotic IMSA races on the Detroit street course.<br>New weight increases for both the 2026- and the 2025-spec Porsche 963 headline the Balance of Performance for the 2026 Chevrolet Detroit Sports Car Classic.<br>After the small break at Laguna Seca raceway, the factory Porsche 963s are back ...<a class='more' href='https://www.motorsport.com/imsa/news/bmw-emerges-as-detroit-imsa-favourite-despite-porsche-bop-weight-hit/10824988/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-ALL&utm_term=News&utm_content=www'>Keep reading</a>