Hmmm, well your first post didn't say HFC's. Ok well now that you have that I don't think you'll really see benefits with headers. Maybe if you had gone long tube headers because typically one piece instead of a combo of headers and hfc's seems like work better. Short of going twin turbo or supercharger I say go with 4.08 gears. I didn't have them on my Z but the rep is that they really wake the car up on the low end. Vids have been posted of a bolt on Z with gears running a 12.xx quarter mile. That would be my next mod in your application.
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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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