Anyone know the od size of the pipe on the 2nd cat on a 03sti?
Just want to make sure my decat fits before I take the cat off. Thanks

 

All the OE exhaust pipe work is 2.5in

 

The od of the decat I have is 65mm or 2.559"
Does that sound like it will fit or is the oe pipe exactly 2.5"?

 

If its a subaru specific decat pipe it should fit no problem, Do you know what make it is?

 

It is Subaru specific but I know you get 2.5" and 3" decat pipes.
Don't know the make but I have a pic

 

Looks the same as the prodrive decat pipe(Same design) so it should fit

 

Gdgd I just wasn't sure because sometimes people say its 3" when actually its more like 2 3/4" or something. This is on the bigger side of 2.5 so wasn't sure if it's what people would call 3". If that makes sense lol