Suburban 454 / 7.4 Exhaust Options in 2015

TKerr

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Magnaflow 23453 Direct Fit Catalytic Converter for manifold to muffler flange.
And:
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Mangonesailor

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I don't know what prices are for your local exhaust shop, but if I were to go this route for my truck it would be around $500-$600 for a system like I described from the muffler shop I go to.

That's pretty reasonable.

Here's stuff

The single outlet exhaust can't be configured to fit a 454, just 350s.

That's not to say it won't since the 350 and 454 systems are very similar, even my old system and my dad's 350/c2500 system looked the same and were sized the same.
 

5vortec7

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If it were me and I had a little money to burn, I'd get a Black Bear tuned PCM with the EGR and CATs deleted, Hedman or Gibson shorties to a single 3" pipe through a high flow cat of some sort, and the either run it 3" single out the back or do a single in/dual out muffler with 2 1/2 inch or 3 inch tail pipes.

I don't know what prices are for your local exhaust shop, but if I were to go this route for my truck it would be around $500-$600 for a system like I described from the muffler shop I go to.


I live too close to Denver so I have to get emissions. They pull out a mirror on a stick to check under vehicles to make sure there’s still cats installed.
 

5vortec7

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That's pretty reasonable.



The single outlet exhaust can't be configured to fit a 454, just 350s.

That's not to say it won't since the 350 and 454 systems are very similar, even my old system and my dad's 350/c2500 system looked the same and were sized the same.
I just did the exhaust myself on my 98 350 last October and was wondering if The same setup would work.
Cats- http://a.co/fQDtZEJ
Cat back with muffler- http://a.co/9CFf0UA
Going to get under both and do some measuring. Since I went with the high flow option I was thinking the pipes might be the same diameter but have to take the time to check it all out. Other than that I think I found a walker exhaust drivers side with Y pipe and passenger side that are direct bolt in.
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But for over $600 dollars for just the cat setup I’m thinking I might keep looking, maybe buy the parts and weld it myself.
 

TKerr

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That's pretty reasonable.



The single outlet exhaust can't be configured to fit a 454, just 350s.

That's not to say it won't since the 350 and 454 systems are very similar, even my old system and my dad's 350/c2500 system looked the same and were sized the same.
I have used it on two other 454 suburbans with no issue. One was a 1997 and the other 1998. My current truck came with a single from factory until I changed it. But my current exhaust is custom and the new exhaust going in it has to be custom, but that is because of my setup.
 

Mangonesailor

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I have used it on two other 454 suburbans with no issue. One was a 1997 and the other 1998. My current truck came with a single from factory until I changed it. But my current exhaust is custom and the new exhaust going in it has to be custom, but that is because of my setup.
So, do you have a part number?
 

Supercharged111

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I went with this bus muffler from Walker and a Diamondeye 4" tailpipe. Dual 2.75"inlets, we'll see how it all goes together when I get home to deal with it.

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Papablunt

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I went with this bus muffler from Walker and a Diamondeye 4" tailpipe. Dual 2.75"inlets, we'll see how it all goes together when I get home to deal with it.
I know it's been a few years, but did you ever finish this setup?
 

yevgenievich

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I did, it's somewhere in my dually thread. Link in sig. I think I did that fall of 2018?
How is the sound on the muffler. Walker tech told me buss muffler would be louder than standard large body truck muffler(4" in/out)
 

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