The Injen's you're talking about are the ones that are way down low in the fender wells or something? You don't really hear the longtube intakes as much as you do the short rams. Don't worry though, they are there! lol
Give your car a few days to adjust, as previously stated...
I have a 2010 G sedan (same engine). HFCs were my first mod... didn't feel all that much, but I knew I was going to get a full catback (went with Fast Intentions), and intakes (went with Stillen Gen 3) and wouldn't really feel anything until everything was pieced together.
First, the FI exhaust... paired with the HFC, I definitely felt some gains. Had the Stillen Gen 3s installed this past Friday, and those really tied everything together nicely.
Give it a few days. You will be good to go.
