Is there anything that will bolt up to these headers? I thought that they would bolt in but I have 2 pipes running all the way back to the muffler. I would like to keep it quite also

 

With the y-pipe and cat option they should bolt right up to your factory pipes and muffler.

 

what he said, unless you already hacked that flange up

 

Maybe Im not seeing it but I have 2 3" pipes running all the way to the muffler. Probably 3 feet past the y pipe flange on the headers. I dont see anything to hook it to?

 

It sounds like you have the Y-pipe for a 1500. The 2500's dont have a Y, just dual pipes all the way back to the muffler.

 

run true duals!

 

Looks like I have to bring the ones I have back.. Anyone have the part number for the Supermaxx for the 2500HD?

 

I don't thnink they make it,
Your 2500HD cat pipe(s) are differant than the 6.0l cat pipes on a 1500( SS, H2, Denali, Escalade) Your one cat is farther back on the passenger side and built into the rear exhaust section. The over layout would take some customizing by a good shop to make the Dynatechs work.
I wouldn't hack up $1200 Stainless header system unless the shop was going to graft in stainless as well,
Your best bet is to buy just some long tubes and have them adapted into the cat pipes.

The 5.3 Y-pipe and 6.0l 1500 Cat pipe(s) only differ in the fact the 6.0l don't y together.
The 8.1 and 6.0 2500HD have a differant cat, joint layout.

From what I have tried having the 3 cat pipe configuarations at one time.

Sorry.

 

Look into the TOG's for a header with a 3" collector that will mate to your stock y-pipe. Without reducers and stuff.