ok fyi everyone..... I have had the injen cold air intake installed by injen
for over 7k miles and the other techs including Aaron are correct. PUT YOUR STOCK INTAKE BACK ON. I have more power now that i put my stock intake back on. Here are the symptoms before:
when it is hot outside or in traffic while it is hot outside the car loses so much power it acts like you have a bad spark plug or something, shifts terrible and if you put the a/c on high and accelerate then it will be blowing hot air for a moment during heavy acceleration. I read an article way back from an x ford tech and current tuner and he said cold air intakes are useless on the focus without a tune to go with it. So, I will be purchasing cold air from Aaron when he has it available with his tuner. Just my experience for what it is worth.