Review on AEM 21 488B Blue Intake System by Kevin Brianne

Installed on my Mazda 3s 04 it completely changed my attitude towards the car. It doesn't produce a harsher sound, it's a bit guttural but only after you hit 3500+ rpm. I noticed a little more gas mileage, but it made up for it by cruising at higher rpm to hear that faint roar. Installation was easy, but removing the stock airbox was a pain. It took about 60-90 minutes to remove the stock airbox and resonator and then about 10-15 minutes to install them.