cat

[dusty]

i don't know if im in the right place or not but need some advice early 1999 4x4 2500hd 2100000km. my exhaust was altered when i bought the truck it has stock down pipe on it then is 4in. all the way to the end with a muffler but no cat does it make any or much difference without the cat. and should i change the downpipe to 4in. thanks in advance

 

[Acesneights1]

Getting a 4 inch Downpipe in there would be like trying to get Oprah into a thong, Aint happenin...As far as Needing the soot trap(commonly referred to as the cat) the only reason you would need it is to pass your local emmisions"IF THEY REQUIRE IT". It can easily pass without it unless they do a physical inspection for it.

 

[iamdave0887]

Getting a 4 inch Downpipe in there would be like trying to get Oprah into a thong, Aint happenin...

I think i just threw up a little. Thanks for that nasty image Kenny. uke:

 

[Acesneights1]

Well, I miss GMCTD's little colorful explanations so I try to make some of my own. I guess mine are more repulsive than colorful....:rofl:

 

[JMJNet]

IIRC, the 1999 don't have the cat or soot trap anymore or at least some of them.

 

[Acesneights1]

Both my 2000's ..."Did"

 

[Turbine Doc]

Getting a 4 inch Downpipe in there would be like trying to get Oprah into a thong, Aint happenin...

Kenny mental images you post like that should be prefaced with a warning

 

[dangerousdave]

Kenny, those little mice will haunt you for the Oprah thing.

Dusty, my '94 came with a "cat" = soot trap. I KNOW THIS GUY that

took his off, rammed a pipe through it cutting out the substrate/monolith through the center. Then THIS GUY welded the pipe in place and reattached it to the exaust. Sounds better, lower exhaust temps, better fuel mileage, and best of all, the "thunk test" of whacking the "cat" to see if it was emptied will not fail.

Y'know, it's illegal in Commiefornia to alter smog equipment...
I'm not sure in Alberta. We do have a few members up there.

 

[Acesneights1]

Kenny mental images you post like that should be prefaced with a warning

):h