I am interested in this as well as I did the Mod 2-3 weeks ago. Also can you turn the Tuba downwards? would that catch cooler air?I agree in that I should go for the CAI eventually. But I don't want to get one unless I get the CPE MAFci, so I'm waiting on that and just trying the air box mod as an experiment really. So far I like what I hear, but I did take all the parts off, including the tuba, flapper, and tray. Would anyone recommend putting any of those three parts back on?