just replaced my intake gasket on my 02 2500hd 6.0 fixed the cold start issue.
but i still have a rattling cat,was looking to possibly just buying a whole y pipe kit from magna flow
MagnaFlow 93622 - MagnaFlow Direct Fit Catalytic Converters - Overview - SummitRacing.com

i dont want to hack up the exhaust by adding a partial kit.
thanks
Ed

 

i would hit up the local junk yards. OEM is the best route. I found mine on craigslist.

 

Why are you looking for a y pipe anyways? The HD trucks came with factory dual exhaust into one muffler.
check before you buy...

 

from reading his original post, he has a rattling converter and doesnt want to cut it up...did i miss something?

 

the cats on the 2500 hd's are 2 parts left and right side if your not redoing the exhaust you need to find out exactly which one is bad

 

Like I said I do not want hack up the factory exhaust.
I am well aware of what I have,how many cats etc.
Thanks
Ed

 

Just cut 3 sides of a square peel it open and gut them with good welding looks stock unless emissions are an issue JMO.

 

Sorry, just wanted to bring it up. Some ppl dont know this. To me though, seems the easiest thing to do would be just replace the cat. You're not hacking it up really.