you are best off with a long tube intake such as the G3's or Injen (which is more expensive). The reason being is that the design keeps the filters as far away from the engine compartment as possible thus ensuring you are always getting cold air. The problem with the HKS system and any short ram system is that they usually do not come with heat shields. Thus over time as the engine warms up and the entire compartment heats up, your intakes are in the "hot zone", pull in hot air, and give you little to no power increase. Infact some have reported that they lose power. I see you've been posting about intakes awhile now so if you have any questions PM me, no reason to go on starting threads that don't get answers.
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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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