We're mixing up price with performance. When it comes to performance gains Stillen and Injen are the best, they place the filters far away or out of the way of hot air thus creating more power.
The bang for the buck intake has been the MAF tubes and drop in filters.
Personally I went with Injen but I got them slightly used from a forum member at a very good deal, haven't had a chance to dyno since the install.
If you really want to wake up the Z and you plan on staying NA throw down for some gears 4.08's will really wake you up.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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