i doubt there are any states that allow any vehicle to run without a muffler. i know i got nailed for it when i lost mine and didnt want to put it back on right away. judge even went outside and stuck a pencil in the exhaust of my bike to make sure it was there.
you should get a car that has better sound proofing as well as a better stereo. or take the tampon out and grow a pair.
i have a modified cb750 honda that usually runs a kirker 4 to 1 header for exhaust. when i swapped it out for some drag bars and cherry bombs, it was louder, more throaty and definitely got me more noticed in traffic. with the kirker set up id have to get the rpms up over 3500 to make enough noise to be noticed. when i ran straight drag pipes (not recommended) i had people rolling up windows at intersections. when i resurrect my bike as a chopped up bobber, it will run drag pipes with a minimum of back pressure and oversized pipes, just because i like that sound. besides, its fun to cruise through parking lots and see whose alarms are set to high sensitivity