what size are stock exhaust pipes?

[Hard_Liquor]

I want to swap out my stock muffler with an aftermarket one that has a nice growl. Just doing muffler and not entire cat back. What size inlet/outlet do I need on the muffler to make the swap with the existing pipes?

 

[SWADE23]

uh im no mechanic but, it be nice to know what year expy you have to start with? maybe the size varies depending on the year of the truck

 

[ELVATO]

This is the one I swapped into mine:

Magnaflow 5X8X18, 2.5 center, 2.5 offset

This is for an 03, 4.6L, though I'd assume it's the same size for all the years.

Installed:

 

[bdvinc02exp]

Not sure what year you have but I have a 2002 with 4.6. I have recently removed the 2 small cats and gutted the 2 large cats and installed the 40 series flowmaster. 2.5" in center to 2.5" out offset. This thing truly sounds amazing.

 

[CTC B4Z]

to my knowledge, no one has ever put a ****** Aerochamber on one of these trucks...I have one on my IROC and thats what I'm putting on my truck very soon

 

[XLTman]

i believe its 2.5 to be sure take a tape measure to the tail pipe to really know what size yours is