There is a "good" loud and a "bad" loud. A honda civic with a 4 inch fart can muffler is a bad loud. A worked '67 Shelby mustang with 3 inch exhaust is a good loud.
I'll try to sum it up here:
A modified and tuned V-8 is a GOOD loud.
An 150k miles car or truck that desperately needs rebuilt, with loud mufflers is a BAD loud.
An import either modified or stock is always a BAD loud.
A Harley motorcycle is just pure JUNK. I hate to say that cause they are American made but I'm afraid Japan has us covered when it comes to motorcycles.