I own a 2004 Buick park avenue (naturally aspirated) bone stock. Came from my grandmother. great car, but its missing the loud factor on the exhaust. I have been watching a few YouTube videos on some good sounding buicks, but I want a second opinion. Can anyone recommend an exhaust setup/ muffler (relatively cheap please im not made of money!) that would sound nice?

Flowmaster, or Magnaflow sound decent on these 3800'*. But then again, if you are trying to save money, you won't get the full benefit of a good sounding exhaust unless you start with replacing the rear exhaust manifold, the downpipe, high flow cat and then the rest of the exhaust.

You also don't want to go too loud, because they get very raspy very quickly.