Porsche used the backdrop of this year’s Rennsport Reunion at Laguna Seca to debut its ultimate 911 track car, the new 911 GT3 R Rennsport. The car is a limited edition based on Porsche’s 911 GT3 R race car, with just 77 destined to be built and each carrying a price tag of $1,046,000. Because it didn’t have any racing regulations to meet, the car…