At one time in the 1950's, there was a car called the Speed Sport, modified roadster. All glass body, rear engined, short wheelbase, and all 8 exhausts ran out the back of the car. Car ran both unblown & blown, and at one time held the record as the fastest car in drag racing, regardless of class. That car compared to today's cars is apples & oranges, but you gotta wonder how much the exhaust system contributed to the cars' speed. If you did that with a modern day T/F or F/C, it would almost be like jet assist, provided the cars would go straight. Just a wild hair thought but does make you wonder why someone hasn't tried that. I think the current F/C headers are giving close to the same effect w/o giving up downforce. Gary Beck tried headers on his T/F car that were kinda giving the same effect, but the car had a tendency to get out of shape because of it.