00-01 Cat back different than 02-06

[drdave81]

I can't seem to find why the cat back exhaust systems are different for 00-01 from 02-06 for the Denalis. I even reached out to Magnaflow why their cat back is only listed for 02-06 and they couldn't give me any better answer than "our engineers must have seen something different". Does anyone know what would be different? Magnaflow and I think it was Gibson all list 02-06 for applications for their cat backs, 00-01 is not applicable.

 

[swathdiver]

Check the Walker Dynomax website and see if they show the difference, if any. On my generation, the difference is in the type of flange used after the cats. The early version used 2 bolts and the later ones used a clamp for example.

 

[drdave81]

Check the Walker Dynomax website and see if they show the difference, if any. On my generation, the difference is in the type of flange used after the cats. The early version used 2 bolts and the later ones used a clamp for example.

They don't list a cat back for any of the 00-06 6.0L, only the 5.3L. I'm starting to think it'll just be easier (and cheaper) to just put a whole 5.3 exhaust, from long tubes all the way back on instead of a 6.0L. My main concern is I keep seeing 5.3 headers and y-pipe may or may not fit nicely. Tonyrodz had to completely pull his front drive shaft out for his headers/Y-pipe. Not an option for AWD.

Where as the ARH headers or Kooks guarantee fitment. Hefty price tag on them though, and then I'm running into this unknown cat back issue lol. I'd also have to find a place somewhere in the system to weld in a converter, since I don't want all the added noise of catless exhaust.

 

[swathdiver]

They don't list a cat back for any of the 00-06 6.0L, only the 5.3L. I'm starting to think it'll just be easier (and cheaper) to just put a whole 5.3 exhaust, from long tubes all the way back on instead of a 6.0L. My main concern is I keep seeing 5.3 headers and y-pipe may or may not fit nicely. Tonyrodz had to completely pull his front drive shaft out for his headers/Y-pipe. Not an option for AWD.

Where as the ARH headers or Kooks guarantee fitment. Hefty price tag on them though, and then I'm running into this unknown cat back issue lol. I'd also have to find a place somewhere in the system to weld in a converter, since I don't want all the added noise of catless exhaust.

On the generation following yours, the 5.3 and 6.0 exhausts are the same. The 6.2s got 3.5" tubing.

 

[drdave81]

On the generation following yours, the 5.3 and 6.0 exhausts are the same. The 6.2s got 3.5" tubing.

The 6.0L was different on the 00-06. It's a dual inlet to the muffler, with a single outlet. So there is no Y-pipe.

 

[mikeyss]

00-01 the egr was different, but that was up at the passenger side exhaust manifold.

 

[drdave81]

00-01 the egr was different, but that was up at the passenger side exhaust manifold.

View attachment 368212

Yeah, that wouldn't have any impact on the cat back though. That's what I can't figure out is why they say the cat back won't fit 01

 

[swathdiver]

The 6.0L was different on the 00-06. It's a dual inlet to the muffler, with a single outlet. So there is no Y-pipe.

Thanks for the info! I reckon then that one could just utilize just about any 3" single configuration to good effect.

00-01 the egr was different, but that was up at the passenger side exhaust manifold.

Hey Mike! How have you been?

 

[mikeyss]

Thanks for the info! I reckon then that one could just utilize just about any 3" single configuration to good effect.


Hey Mike! How have you been?

Been doing ok, work has consumed my life lately. How about you?

 

[swathdiver]

Been doing ok, work has consumed my life lately. How about you?

Pretty good when not in the hospital! Glad to hear you are doing well.

 

[adventurenali92]

The 6.0L was different on the 00-06. It's a dual inlet to the muffler, with a single outlet. So there is no Y-pipe.

this isn’t entirely correct. When I pulled the factory muffler out of my 2006 Denali with an LQ4 6.0, it had dual in/out pipes and a Y just behind it to go to the single passenger side exhaust exit piping. Which is why I stayed with a dual in dual out magnaflow muffler.

 

[drdave81]

this isn’t entirely correct. When I pulled the factory muffler out of my 2006 Denali with an LQ4 6.0, it had dual in/out pipes and a Y just behind it to go to the single passenger side exhaust exit piping. Which is why I stayed with a dual in dual out magnaflow muffler.

I was referring to a Y-pipe coming from the manifolds into the muffler. This is what makes the 6.0L exhaust set up different than the 5.3, which has a Y-pipe and a single inlet at the muffler.
Interesting that they did that though.

 

[adventurenali92]

I was referring to a Y-pipe coming from the manifolds into the muffler. This is what makes the 6.0L exhaust set up different than the 5.3, which has a Y-pipe and a single inlet at the muffler.
Interesting that they did that though.

Oh I see what you’re saying.

 

[HD_LS]

If anyone is interested in buying it, I have a complete 6.0 Denali/ Escalade Magnaflow exhaust, with the 3.5 inch diameter muffler back pipe size & 4 inch tip. Used only about 200 miles...

 

[Tonyrodz]

If anyone is interested in buying it, I have a complete 6.0 Denali/ Escalade Magnaflow exhaust, with the 3.5 inch diameter muffler back pipe size & 4 inch tip. Used only about 200 miles...

Location?

 

[HD_LS]

A long way from NJ But I'm willing to ship it ...

 

[Tonyrodz]

A long way from NJ But I'm willing to ship it ...

I just bought some mufflers, so I'm gonna try to cobble something together. Thx for getting back to me tho.

 

[diLucca]

Kind old thread, but if anyone wants the info for 00-01 vs 02-06 difference.

Difference is with position of first hanger(after Y pipe), which are welded on frame, so for early models you have to cut and weld hanger little further on frame.