Should I install a cold air intake or just keep my old stock intake? Will I gain more horsepower? Will it throw off my computer to where it would cause other sensors to trip and not get the same performance? Will I still get the MPGs I'm getting now?cause my stepdad is a know it all and he told me that if I put the cold air intake on it would mess the car up and throw off the computer and get less horsepower.please give me some advice.Thank u for ur time reading this.