I had one short coby befor the diff and a long super coby with the single chamber close to the tail pipe on my triumph 2500, it wasn't too loud and wasn't raspy at all,
also on a 4.1 falcon I had just one coby befor the diff, it sounded like a v8 at low speed driving, wasn't stupidley loud,
your car from stock would have 2 or 3 free flow style mufflers