Try glass packs first. They're cheap and according to the size you get different sounds.

Longer / deeper / quieter

Shorter / louder / more ricey

I put a 31'' on my 300 and I like it.

 

Magnaflow used to make a muffler called "MagnaPack". Looked like a very short cherry bomb but stainless and not much bigger in dia than the cat back. On a Mustang V8, they were VERY LOUD! Cut a little sound but not much...