Remember Showroom Stock racing in the 1980's?
Things like wheels/tires/brake pads/etc. could be changed, one car trounced the others so bad it was disqualified from the competition, >Chevrolet Corvette.
Some races Corvettes would get the first 15-17 places, maybe a Porsche 944 Turbo would make it into the high teens finish spot.
It was a sad time for many manufacturers, Mustangs had 4 lug wheels and a common problem was they would fall off the pony-car.
The Corvette went on to its own series Corvette Challenge, others could enter, few did, even some high-dollar exotics Ferrari/Lotus came out for an ass-whipping.
