>> Most states have laws that you can't modify an exhaust to be louder than the stock exhaust Not the big ones. California only limits to 95db, regardless of

>> Most states have laws that you can't modify an exhaust to be louder than the stock exhaust Not the big ones. California only limits to 95db, regardless of what stock was. And what is "stock"? Like new? Mufflers start to wear out, getting louder, the moment a car is first started. Not everyone can afford to drive a new car, or even keep replacing the muffler every couple years to maintain some notion of "stock" tailpipe sound. Some of the loudest cars/trucks are simply those old enough to have broken mufflers. And people with deliberately loud cars want loud cars. If it wasnt mufflers it would be loud sound systems. If not those then it would be loud horns.