cold air = top end power
short ram = low end power

the reason being, cold air goes all the way down almost to the wheel and has a bend, so it takes longer and the engine has a harder time sucking in air, but it gives more HP since its COLD AIR and not warm air.

short ram is straight through with no bend or hardly any at all, so gives u more low and mid range power since it takes less time to suck the air in. hope that helps with ur decision