I am unable to find a Magnaflow cat-back system when I search for my 05 CC/SB Sierra Denali. Does anyone know if Magnaflow kit #15782 for a 2005 V-8 6.0L Crew Cab, Short Bed, will work with my Denali?

Otherwise I was just thinking of replacing the muffler.

 

No it wont. The 1500HD has a different wheel base than your Denali. The only cat back for a 6.0 equipped 1500 CCSB with the 5'8" bed is made by Corsa $$$$!

 

That's what I was afraid of.

Thanks for the info.