5.3 Style Y-Pipe on a 6.0?

[Dan Acosta]

I am learning a lot today about exhausts. Has anybody switched from a dual-pipe 6.0 exhaust to a 5.3 Y - pipe style exhaust?

 

[S33k3r]

I am learning a lot today about exhausts. Has anybody switched from a dual-pipe 6.0 exhaust to a 5.3 Y - pipe style exhaust?

Why would you? What are you trying to gain?

 

[Dan Acosta]

Well, I think I have a bad cat. The exhaust system on my truck is a 2 into one muffler style. One of the cats is part of the muffler, and that is the bad one. I cannot find a replacement for this muffler/cat combo anywhere, so I was considering just swapping out the whole system to the 5.3 style exhaust. Other options are to try and just replace 1 cat (cut and weld in), or gut the cats and tune for it.

 

[Tonyrodz]

Well, I think I have a bad cat. The exhaust system on my truck is a 2 into one muffler style. One of the cats is part of the muffler, and that is the bad one. I cannot find a replacement for this muffler/cat combo anywhere, so I was considering just swapping out the whole system to the 5.3 style exhaust. Other options are to try and just replace 1 cat (cut and weld in), or gut the cats and tune for it.

If it was me I'd just replace the bad cat--cut and replace.

 

[Dan Acosta]

This is what I am working with. Its a California 4 cat set-up. I will be taking it in for an estimate on two hi flow cats and maybe the muffler.

 

[drakon543]

rockauto might have what your after. the image you linked shows the right side cat all the way back by the muffler. the right side rockauto lists is farther forward. the walker brand right side specifically states carb compliance when i pull it up.

 

[Dan Acosta]

There seems to be a lot of options - as far as upgrades or replacements for the single inlet style. There are hardly any for the dual inlet style. I thought it might be more common since (I believe) all the 6.0s have the dual inlet style.

 

[iamdub]

Aftermarket cats are known to not be sufficient or long-lived and OEM cats are super pricey. If it were me, I'd have the cats replaced with straight pipe and a custom tune that includes deleting out the rear O2s. You'd still be hundreds ahead and a failed cat will never be an issue. You can have fake cats welded in if you have to pass a visual inspection.

 

[drakon543]

Aftermarket cats are known to not be sufficient or long-lived and OEM cats are super pricey. If it were me, I'd have the cats replaced with straight pipe and a custom tune that includes deleting out the rear O2s. You'd still be hundreds ahead and a failed cat will never be an issue. You can have fake cats welded in if you have to pass a visual inspection.

seemed like he might be in ca i think they are pretty picky out there

 

[Dan Acosta]

I have the truck in Florida, but previous owner had it shipped from CA.

However, I took it to a muffler shop just to see what they might suggest, and the manager seemed to think it wasn't an issue if there were no codes. So much so that he really didnt even want to quote me (I respect that he wasnt trying to take my money), but eventually he said Magna-pro hi flow cats would be 240 each.

 

[Tonyrodz]

I have two brand new high flow cats I'm selling.

 

[Rocket Man]

Don’t go to a 5.3 exhaust, the 6.0 exhaust flows way better.

 

[swathdiver]

Dan, how much different is your exhaust compared with the pickups? It is possible that up to the muffler they are the same.

 

[Rocket Man]

Dan, how much different is your exhaust compared with the pickups? It is possible that up to the muffler they are the same.

My Denali 6.0 is completely different than the 5.3 systems- it's dual all the way back to the muffler and bigger diameter piping. No y-pipe. When I installed longtubes the entire system is included all the way to the stock dual muffler input and it's completely different than the ones sold for the 5.3/ 4.8's.

 

[swathdiver]

My Denali 6.0 is completely different than the 5.3 systems- it's dual all the way back to the muffler and bigger diameter piping. No y-pipe. When I installed longtubes the entire system is included all the way to the stock dual muffler input and it's completely different than the ones sold for the 5.3/ 4.8's.

No, I mean same motor, different chassis Mark.

 

[Dan Acosta]

This is similar to what I have except it has 4 cats (California Truck). My truck is a 2500 Yukon XL, and I havent found that the exhaust parts interchange, but I could be wrong.

 

[Rocket Man]

This is similar to what I have except it has 4 cats (California Truck). My truck is a 2500 Yukon XL, and I havent found that the exhaust parts interchange, but I could be wrong.View attachment 210626

2500's are different than the 1500's, parts don't interchange.

 

[drakon543]

ok yes 2500 makes a big difference. magnaflow has a listing for California legal catalytic converters for your truck. on my phone so the images dont come up right but it shows a left and right side. then it also lists a universal one probably for that last one infront of the muffler.