The last two pipes are the muffler(s) with a 2>1 3" collector ahead of it.

Looks good rob, but I'm anxious to see your header designs.

The removable cats and resonator would be cool as long as they weren't a big PAIN in the **** to get to and remove. Otherwise you may as well make them permanent.

Are your headers going to be LT's or shorties? Unequal length I presume?