Site isn't letting me PM you for some reason.
Get the exhaust made for your exact car. Or you could conver the V6 to a single if you want. But V6 is dual outlet, i4 is single outlet.
The catback comes with two piping pieces (one has the resonator and the other has the muffler connection) which go from the cat converter to the back of the car, the muffler(s), & clamps/coupler/hardware. If you're V6, this is what you'll get: