With the AFE that I had, with a clean filter, I could put the chip on the highest setting and if I laid into the throtle a fair bit, the over head console would chime and show the message to service air filter meaning that there is too much air restriction. I have been back to the stock box with the mod done for over a year and have never seen this message since which tells me that I'm getting more air and cooler air with this set up and I don't have to wonder if I'm getting to much oil on the sensors in the intake and intercooler, or if I'm letting to much dust or too many rocks into the motor.