cold air intakes are pretty simple. In my experience, ones that someone made themselves often look better, fit better, and seal better than anything you can buy for a decent price. While $20 for materials isnt bad, I wouldnt be surprised to see that it has fitment quirks and that you need to modify a few things to get it to work well. You could get piping sections and band them together for a better look in the end IMO.
Also, on the auction it says "No filter, clamps, couplers, or sensor adapters are included. You will need to source these parts seperately to make a full intake kit. We are overstocked on the pipes and are discounting to clean inventory. This is a perfect chance for those who like to customize and fiddle or tune with how the engine runs based on your liking as the aluminum pipes are easy to modify." so im willing to bet it's going to be more trouble than it's worth.