just a quick question...

whats the exhaust piping diameter (stock) on a 2006 5.3 L 4x4 ext cab

 

2.75", I'm pretty sure. Try a search to confirm.

 

Thats what mine measured to!

 

same here

 

so does that mean i would buy 2.5" exhaust or 3" (cat backs) cuz i dont see any 2.75" ones

 

If you're buying the whole specific fit catback, just get whatever listed for your specific truck, it will bolt up after the Y-pipe. If you are getting just a muffler, get a 3" in/out, and it will slip over the existing exhaust pipe and the welder can make up the difference.

 

Yeah I ordered a 3" Magnaflow catback, if you are going true duals, 2 1/4 will be plenty, but for single I would say go 3".

 

will 3" cat back (not true duals) bolt right up? I wasnt planning on welding

 

i have a quick question to bring this thread back to life... is both sides 2.75?? is that O.D or I.D??? i want to for right now just get a muffler to get a little more sound out of it untill i get enough for LT's and a exhaust set up.. but any way waht muffler should i use offset inlet/outlet?and then turn my muffler straight up and down. i dont want to have to bend the pipe any. i know i will have to add some extra pipe, buti dont have a bender and dont want to go pay a fortune at an exhaust shop

 

The exhaust pipe is 2.75" but I think the headpipes from the manifolds to the y-pipe are 2.5".