In no particular order:
# Birth of the 426 Hemi.
# Ayrton senna crash.
# Sequential/tiptronic/paddle shift/CVV Transmissions.
# NASCAR with the cars all looking the same and far from street cars.
# Ronnie Sox, Dlck Landy, Big Daddy, & The Boys.
# Salt flats & hot rod racing (possibly the biggest).
Worst = Rotary engines.