catalytic converter inlet diameter

[blk92suprat]

Does anyone know the inlet diameter of the factory turbo catalytic converter?

Im guessing 2 1/4 inch since thats what the rest of the stock piping is?

Thanks

 

[heavydrifter]

Mine is three inch. When I went to go swap the cat for a test pipe they were the same inlet and outlet size.

 

[Rennat]

my turbo exhaust is 2.5''.... so and the cat is welded to the pipe, so im going to say 2.5''