The real 273 HP exhaust sound

I've noticed the accurate LTD reproduction resonator does not look like a factory one. I'd buy this one instead:

http://www.nationalmoparts.com/merchant.ihtml?pid=1949&step=4

I had a guy make me one based on the drawings provided above, and I handed him an original one to look at too. He made me a nice rectangular tip from stainless steel and used a newer model resonator can, a bit shorter than a factory one but the right size otherwise.

It's my understanding that a muffler was optional depending on what state your car was destined for. I run with just the resonator, no muffler and it sounds great. A little loud, but not too loud at all.