Well, hmmm . . . MG Anecdotes?
The MG EX 181 ran a tail fin in 1957, but Sterling Moss complained of cross winds.
When they came back in 1959, the fin was gone, and Phil Hill ran faster, but there were other improvements to the car.
Unofficially, Hill was on the team in 1957, and drove the car faster than Moss, but they wanted Moss for the press value.