2.25" inlet dual oulet, perferated core (like a resontor) what you see is what you get, I will ship if need be. Asking $35. Brand new out of the box, never installed. I bought the cheapest catback I could find that was manderal bent cause I wanted the prebent, manderal bent, piping, this is the mufler that came with it, I have no use for it as I'm adding my own resonator and mufler. Who wants it