Ok, a coworker of mine just installed a aem cai. After numorous rides in his car and races with our two si's...the intake deff. made a difference in his cars performance. I dont like to copy, and this makes an excellent scenerio to compare AEM vs Injen. A lot of the posts on here bash the Injen and talk about occasional CEL's...my friends CEL has never came on with the AEM. I'd like to compare them but I dont want to BUY a loss of power and CEL problems. For those of you that have the Injen are these posts true? What do you think I should do?