I got a ram air filter. Really deep induction noise. Cant tell any diff with power. Probs feels abit quicker but that might be in my head cause of the noise of it. But for 44 bucks it's good if u like roaring along built up skinny echo type roadswhat are the ram air kits like for ph1 172? Any one used it or whats bester to use just got standed air box at min