I have a 2006 F-250 with the 6.0L Diesel, does anyone know what the stock exhaust diameter is? I need to know what size reducer I need to purchase 3" or 3.5", I'm not sure. Any and all help is greatly appreciated.

LCDR Dan

 

If I remember correctly my stock diameter was 3.5". It was on my '05, but I don't think that makes any difference.

 

The downpipe is 3" then goes to 3.5" all the way back

 

I believe I read somewhere that the DP is 3.25", but I've never measured it so I can't confirm. Definitely 3.5" from the cat back.

 

it depends on where your cutting it? what are you trying to accomplish?

 

Down pipe to cat has been reported at 3". I'd say the cat is 3.5" on either end as the OEM tubing is 3.5" from the cat back.

 

It sounds like he's trying to put a different muffler on the stock system or go with a straight pipe.

 

my stock exhaust tailpipe measures 3.5

 

I am trying to do a cat delete but looking to use oriellys instead of ordering online. What size pipe do I need and what size couplers do I need?