Well, I just finished installing an Injen CAI on my TRP-E. Was real easy, once I took the grille and brushguard off and, of course, the front facia, but even that went real smooth. I had a cheap SRI before, so I'm not sure what I notice for change in performance, but I do seem to notice downshifts are quicker and the car seems to get up to speed quicker. Hope it's not just my imagine. Will keep everyone posted. Will eventually post some pics.