Agree. It is more of the implimentation than the actual muffler tip or cannon. I uses to have a 4 inch cannon from Cypher on my old gc8 and it was fine. Certainly not quiet but never got pulled over once in nearly ten years. I now have the invidia Q300 system for the hatch and when I step on that with its four 3 inch tips....you know it is there in a big way. But drive past police at slight throttles....they don't even look.

If you really like cannons you could also get a silence or step down pipe to put in to the end pipe for school nights or hot dates. These drop the noise from 4 inches to 2.25 and still keep the cannon look. And you can pull it back out within two minutes for the weekend.

Or there are the varex type cannons. Lots of choices to get the look and sound that you are after.

You tube is your friend in deciding.