There is no filter included with that kit so there is another cost to be applied.
Also bear in mind:
Is the MAF housing the correct size? If its not as close to stock as possible its not good as the car has to permanently adapt the fuel trims as its getting different volumes of air to what its measuring on the MAF sensor.
Is it as well made? First glance it looks like there is no heatshield between the MAF and the manifold which is pretty much right below it, that also means there is no support for it behind the engine either. As well as that, have the inner sections of the silicone tubing been stepped like on the ITG to ensure air flow is not disturbed and made turbulent?
What Filter will you use? Theres is no point in putting a crap filter on, so you will need to pay for something fairly large and fairly decent to make the whole thing worthwhile.