I have a '13 5.0 and decided to go with Borla Pro XS muffler and get a local shop to fab up the rest of the exhaust. I am trying to find the correct part number to order. Every time I think I have the right one, I read something to the contrary. I am leaving resonator and all stock piping before muffler on so which one do I need?

40348- 2.5 in / 2.5 out

or

40349- 3 in/ 2.5 out

Thank you for the help.

 

my borla write up..i got the 40944 si/so 3" to 3"...i wood go with some sort of 3" other wise ull rest. the system.:

https://www.f150forum.com/f38/new-borla-muffler-226512/

 

Thanks! I thought it was 3" inlet but was reading stuff and starting to be doubts. I should have said that I am looking to go si/do so I think 2.5 out will work out. Dual 3in would be a bit overkill.