I think fire retardant shoes are an overkill for high speed driving events. I laugh almost every time when I see someone with their fire retardant OMP or Piloti's with shorts and a t-shirt (which you can drive PCA with).
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"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower"
-Mark Donohue
