probably depends upon where you live.
out here in the wild, wild west....... Anything goes.
Straight pipes, open headers, you name it.
The thing that matters most is lights, turn signals, windshield wipers.
I am not aware of any law in the United States that regulates Horsepower,
no matter how much ya' got.
hondas suck. 1990 honda accord lx four doors really suck.