Horsepower divided by kerb weight, the figure that settles the argument a power figure starts.

1996 Nissan Silvia
Oleksiiown figures

2015 Lotus Exige S
Alex Polistill owned

Counted from what people entered — a typo is not a record. Owner-entered figures are marked; where the figures come from.
2009 BMW M3
Oleksiiown figuresstill owned

2002 Porsche 911
Grishastill owned