Well to be honest, the only thing I have done since I got the car is put the intake on and install the oil pressure gauge. When I was shopping around for a WRX I preferred a bone stock one but this was the best deal I could find and I considered it to be fairly modded compared to bone stock. I don't really plan on doing anything else except maybe a hood scoop air splitter to distribute the air more evenly across the IC and the STi hood scoop because they are a little wider (and look meaner). I'm just a noob when it comes to the whole tuning thing and wasn't sure how accurate the A/F gauge is or if I should be concerned about running rich.