Hd Exhaust Difference?

[Shryniew]

What are the differences between the HD w/ 6.0L's exhaust system, and a 1500 w/ 5.3L's exhaust. Are the cat's any different? Thanks in advance.

[Nytemare]

cats should be the same

the muffler is dual in single out.

 

Not 100% though

[redvett]

Designed for the heavy duty frame. Doubt it will fit the 1/2T

[ws6_guy]

actually the HD muffler is a dual in/out

 

 

 

dont know why they didn't dual tip it, but it would have probably all been on the right side only lol

[Nytemare]

OK, so the system is pretty much a dual, but they skimped again.

 

I don't think the actual cats would be any different though.

 

What were/are your plans anyway??

[GENESPOOLS]

keep the exhaust. if you want duals, have a muffler shop tap off of whats coming out. from what ive read there does'nt seem to be much difference at all [except noise] by going to a cat back system. GM has done a good job with flow[6.0 liter anyway] BUT if you want noise...by all means go ahead

[GENESPOOLS]

oh yeah cats are larger on 6.0, exhaust pipes are 2 3/4"

[Nytemare]

the pipes on my 4.8 are 2.75" too.

 

Are the cats longer??

[ws6_guy]

must be a difference in '05 & ''06 HD exhaust, mine is all 3" with cats, and the single 3.5" tip. I got Magnaflow hi-flow cats though so those aren't the originals, so as for the stock cats I dont know what the specs are for those, but i'm interested to know. & as for my pipes being 3" that must be stock it sure looks it. I peaked under my truck today & its black all zround my cats though.. so must be leaking..

[Shryniew]

The only reason I'm curious is b/c my father in-law's HD has the same Flowmaster setup as my 1/2 ton but is quite a bit louder so I was wondering if it was pipe diameter or difference in the cats. I realize that his is a 6.0L and mine is a 5.3L but I wouldn't think the volume difference would be so dramatic. I've also noticed other HD's in the area sound similar. And I deffiantly want his volume.

[Nytemare]

Its the 3.0" pipe.

Larger pipe makes a big difference.

[ws6_guy]

do you both have the same setups? true duals? if so then yeah it must be the larger pipe size, and possibly tip size, and does he have a CAI?

[Shryniew]

Yea we both have our cats still and both have ture duals.