you fit a (so called) cold air intake low down in your bumper? have you taken a temp reading of the air near the original point and this one while the car is moving, i'm guessing there would be very little difference in PK in summers as the heat from the road woudl negate any benefits of the filter being lower down.
BTW be VERY careful when crossing even the smallest of puddles, it might suck water into the engine and that can lead to bent connecting rods (water does not compress).