K1500 frame splice

[Justin S]

I was not aware of that, I thought they all had stock Y pipes up front

 

[Jrgunn5150]

I was not aware of that, I thought they all had stock Y pipes up front

Nope, Vortecs go 2.25 dual to one muffler like that, HD trucks like mine go from a 2.5" at the manifold flange, immediately up to 3" dual, then staggered cat's, then a dual in single out muffler.

It's why so many Vortec trucks are running around with "True duals", they just cut the muffler off and stuck whatever muffler's they like on it.

 

[TylerZ281500]

true duals yuck, not entirely true, my 97 buddys 98 etc all have a y pipe before whats pictured.

 

[Jrgunn5150]

true duals yuck, not entirely true, my 97 buddys 98 etc all have a y pipe before whats pictured.

Are they 4.3's? Those are the only ones I'm aware of that didn't use the 2 in 1 out muffler.

 

[TylerZ281500]

all 350s

 

[PolarBear]

Nope, Vortecs go 2.25 dual to one muffler like that, HD trucks like mine go from a 2.5" at the manifold flange, immediately up to 3" dual, then staggered cat's, then a dual in single out muffler.

It's why so many Vortec trucks are running around with "True duals", they just cut the muffler off and stuck whatever muffler's they like on it.

Not true on the HD comment. They're 2-3/4" not 3".

 

[PolarBear]

Are they 4.3's? Those are the only ones I'm aware of that didn't use the 2 in 1 out muffler.

4.3 and 5.0 used the y style exhaust.

5.7s were never available with a y style exhaust 96+.

 

[kennythewelder]

If you look at the rotten frame's exhaust (bottom pic) That is a Vortec 5.7L (350) exhaust on a 96 + truck. That is what I had on my 97 until I removed the stock muffler, and ran true dual's on my truck, 2 mufflers with 2 tail pipe's.

You must be registered for see images attach

You must be registered for see images attach

This is what I have now.

 

[Jrgunn5150]

Not true on the HD comment. They're 2-3/4" not 3".

You're right, it's a stupid GM size, a 3" pipe fits over them, my mistake

 

[Justin S]

Everyone's learning something new today!