Hey new guy here!
I have an 03 1500HD CCSB 6.0L and I really wish they made a Corsa DB catback for my truck but they only make it for the 2500HD 6.0L.

My question is would it be a bad idea to put on a Corsa DB muffler made for diesel trucks? Single 4in/4out? I fell in love with the Corsa DB catback after watching various videos on youtube.

Here's a video for those that don't know what it sounds like: (Not my truck)

 

The 1500HD already sit on a 2500 frame, why wouldn't it work??

 

I had the corsa db kit on my 6.0 2500hd, with cats it sounded real good but without cats and with long tubes it sounded horrible. Sounds like glasspacks and straight pipes. I swapped the muffler to magnaflow and it made a huge differance. When i had single exhaust anyway....

 

I'm in CA so I would need to leave the cats on. I guess the only choice I got now is the Borla XR1. I wonder why GM decided to make the exhaust components different from a 1500HD..

 

This was posted on another forum I asked:
"The exhausts are different sizes, so no. If you wanted to, you'd have to replace the manifold (headers) and y-pipe and retune for the bigger exhaust, or do a full motor swap.
They are not the same engine (code wise)"

Not sure how true this is? Can anyone confirm? I always thought the 1500HD 6.0 and 2500HD 6.0 had the same motor and trans.

 

The engine and manifolds are all the same. Both motors would be an LQ4 in a heavy half and the 3/4ton trucks. Even if one was a LQ9, the block is the same size and only the internals are really different.

The y-pipe could be different I guess. I know some have single pipes all the way back to the muffler for each side.

 

You can put any muffler you want on it. You don't need the whole exhaust kit.