Both of those will violate your warranty, which could affect the money issue.
I'd go with the Stillen G3 Cold Air Intakes; I got those and an FI cat-back (not cheap, but awesome) and it made a huge difference.
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2009 Magnetic Black 370Z with Touring, Sports and Navigation Packages--Fast Intentions CBE with 12" Resonators/Carbon Fiber Mufflers and LTH--Stillen G3 Cold Air Intakes, Underdrive Pulley and Grounding Kit--Uprev Tune
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