The McLaren Senna GTR Concept that debuted at this year's Geneva Motor Show is significant because it heralds a possible return to Le Mans for the brand. This would be its first time back since McLaren raced the legendary F1 GTR at Le Mans back in 1998. The new Senna GTR, however, will assuredly be faster than its 20-year-old predecessor, weighing only 2,641 pounds and carrying enough aero effects to produce 2,204 pounds of downforce. While the production Senna supercar will be limited to 500 units, the production version of the Senna GTR will be even more exclusive with just 75 track-only units available for sale.