So not to pull a rookie move but after searching nearly 400 plus posts I have yet to get my answer.

WHAT SIZE IS STOCK EXHAUST PIPE

 

2" or 2.25" for the 4cyl

 

I knor for sure it's smaller than 2.00"
I'd say 1 7/8

 

Yea unless it is LCEngineering or something making it 2 1/2 I believe. Or it could be anything if previous owner(s) changed the exhaust.

 

Ok cause I need a cat converter but Im not paying $200 for one so I found some cheap aftermarket universals on Ebay but didnt know what size to get. Smallest I found was 2" so guess I'll have to flange out the existing pipe. Whoever had this truck before me removed cat and straight piped to muffler so I got nailed on my emmissions test today. Damn people, the only thing Idaho cares about it the cat and you take it off BOOOOO previous owner moron.

 

i dont know about the rest of you guys but my stock piping is actually smaller than 1 7/8"

 

my stock piping was 1.75" but you need 1 7/8" if your using clamps so it will slide over the existing 1.75" pipe

 

OE is 1.625 (1 5/8) ID which is how pipe is measured. 1 is OD with rust or OE type replacement. inside and outside dimensions are different and it matters a lot when buying new stuff to mate to it lol.

my PO did the same thing...OE to the O2 sensor, 2.25" cherry bomb to 1.75 ID 90* bends (meaning it crushes down to about 1.25") to a 2.5" stack. "I read if you go too big on the exhaust these motors you loose all the torque... blah blah blah"