that's what the forum is here for, don't forget to rep if it helped. Headers also known as the exhaust manifold are the first piece that remove exhaust gases from the engine. Fast Intentions, PPE and Stillen all have a variety. They are proven for significant torque gains, I can personally vouch for that. However my advice is get the full GTHaus Catback, hear it see how you like it and then make the choice about headers/test pipes/or HFCs.
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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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