Which is why I said it really depends on how you define " the class." If you look at the cars in the SCCA SOLO F Stock class, then there are several cars that weigh less then the Mustang - assuming the 2015 Mustang GT winds up in the same or similar class. In 2011, many were glad to "see the BMW M3 and the Mustang GT in the same "class,"" in terms of performance - if not price. Then, the Mustang was viewed as a "low cost "BMW Class" car." The 2016 Camaro sounds like it will also "take a different path" from the Mustang in terms of weight - and presumably performance.
By class I mean what competes with the Mustang on the sales floor.