You'd probably need to be driving otherwise identical cars, both with front spoilers, hood seals even better, and one with TA fenders and the other with Firebird fenders. Then you just may feel one is a little more floaty with air build-up. But moreso with underhood heat with the bigger engines, or Turbo. The shaker on these is too far forward to benefit much of the low pressure air at the windscreen. 70-75 Formula scoops were better when open but still a touch short. 76-81 Formula scoops even if open, would do nothing. Too far back, too slim. I think all 'big engines' should have had a fender extractor just for heat. The TA had theirs, the non-TA should have kept the 71 Firebird type.