bmw 323i is slow.....Nothing to be proud of.
Race an M3 or m5
or the newer 5 or 7 series
And on top of it if the car is old and its automatic you loose like a second to get from 0-60.
M3 has a powerful inline 6 it will DESTROY!!! an Impala in a straight line.
Impala is slow, its got a powerful engine its good for abuse but its not a fast car. It might feel fast but thats about it.
Compete with cars in your own league man.