Brandon Marshall may be 32, but he is still confident he can put up the numbers of an elite NFL receiver. To prove it, he is placing his Porsche’s title where his mouth is. The Jets receiver posted a challenge on his Instagram, offering to bet his sports car against Steelers receiver Antonio Brown’s Rolls-Royce in a race to see which wideout will end the 2016 season with more receiving yards. Brown said he would "gladly accept" the bet if Marshall calls him on the phone to be sure he is serious about the wager. Here's a look at their cars and those of other athletes over the years.