The car with the biggest engine displacement is also by far the least powerful car i've owned.
1976 Pontiac Sunbird with a 3.8L V6 - 105 hp
2nd biggest was my 350Z
3.5L V6 with 300 hp.
3rd goes to the BMW M2 with a 3.0L I6 making 405 hp
And the smallest engine i've owned in car was my 1988 Celica all-trac with its 2.0L I-4 making 190 hp.....a full 85 more horsepower than the engine in the Pontiac.