My boyfriend as a 2006 G6 V6 and I wanted to get him a Doctor Speed CAI for Christmas. My question is: what is the difference between the CAI’s on the web site: Cold Air Box and Stage 3. I also wanted to know if there are issues with the CAI triggering the Check Engine Light. I’ve been reading about other intakes, Weapon R and Ingen that are triggering the CEL. Could you tell me why a CAI would throw a code and what to do if it happens. I was assuming that putting in a CAI would void the warrantee on the car is that correct? Also how does the CAI effect hp. Just wondering if you had an estimate on the gains.