They are 2.5 to 2.5. But check the inlet on the magna flow. My 3inch Borla had a 2.5 inlet to fit the stock piping but went to 3" back after. When I did my headers I had to convert the Borla inlet to be 3" all the way back.
I bought the cats off of you and haven't had a chance to install yet because the car is stored away for the winter. Do you know which ones they are? I included a link. I just bought a 3" Magnaflow Catback and I'm hoping they fit! There were 3 options, any help would be appreciated!
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