You dont need a induction kit, a decent panel filter and the airbox mod Seems to be hard to beat, I'm running 400 in my 8 with the airbox Save the money for something else
As you at your airbox the side which face the passenger side You cut the side of the box out, if you look in picture gallery think there is my car then you can see
I have the hks reloaded on sounds great and I have modded the scoop and top of the airbox so they attached so it pours cold air straight on te filter. As said though the standard box will see great results just less noise