When addon for chiptuning

I have installed the PC in my Signum. Because he is not oiled, unlike the KN filters. Those who want additional oil in the intake? No one really because it makes problems in the long run.
I have the filter installed as a goodie for Chiptuning. Otherwise the car will depend somewhat better on gas, that's what I wanted to achieve. Who is there noticeable power increase expected will be disappointed.
In addition, it makes coming filter unnecessary purchases, which is an advantage calculable.
For me, therefore in order. However, the filter is too expensive. That is why only three stars.