i use k&n drop ins on a couple of our family vehicles. napapaisip tuloy ako. nakakatipid in the long run sa gastos ng filter change. power i cannot say i noticed an increase with any certainty. usually na bebenta mga sasakyan namin around 100,000kms give or take. at that point wala pa ako na fe-feel na symptoms ng engine/turbo wear nun dirt passing thru to the turbo and engine. would like to peek sa blades ng impeller ng turbo ngayon.