air intake systems 2006 S4

Hey guys, Just got a new 2006 S4. I Absolutely Love this car!! I'm new to the game however. I was wondering if I could pick your minds for some help. I am interested in modifying this vehicle to get what I can out of it. I have a budget of about $4000 to add to it right now. What would you guys add with this kind of budget? One question that I have is regarding the Hyper Flow Air induction kit. I have heard some conflicting reports about the utility of this modification. Stratmosphere states that you can expect gains of around 10 HP to the wheels, whereas, Motodyne does Not recommend it if you only have a single fuel rail system. I was wondering what you guys think. I'm also looking to chip it out. Which chip do you guys recommend (APR , GIAC, etc..). Thanks guys!!!!!!