Do Shorty headers fit factory exhaust?

^^^^this x2, learn from others. You asked for advice, RRR nailed it. It is a hobby and it costs money like any other hobby, and this one can and will get expensive. So don't spend money you don't have and get spread out all over the car at once and end up annoyed and end up giving up. Take the freebie manifold and pay the shipping, bolt it right up and finish the other parts and keep some cash set back. One day you'll need it. And btw learn to do as much of all this as you can for yourself, itll save you money and you'll feel much better about what you've accomplished.