Being slightly older than you I do not do anything under a car anymore!!! LOL My $6000 worth of tools are nice and shinny now. LOL Even with some being far far older than you. Holy shit I sound like my father. LOL I catch myself saying that more often now, wow! Now don't take that the wrong way, I'm having fun! The reason my avatar picture shows my Raptor hanging is because I had to measure the U-bolts for the bump stop plate the RPG made for me, that's about 7 feet at the bumper, me being 6'1" didn't even have to bend my head to go to the rear. Getting off topic here but I think your mistaking (well it depends on who is explaining it), we are both right. The cat-back muffler has extra chambers/fins/cutouts what ever you want to call them, in it to stop back flow of exhaust and allows the exhaust exit faster. When people talk about a cat-back system this means it has the cat-back muffler, as far as I know. Hey I've been wrong before.