The ringland issues on newer models are a result of people not breaking in their cars correctly, and going nuts with CAI / bolt-ons without ever tuning. The Z is somewhat forgiving of this, the WRX line isn't.
As far as tunes go, I had the Cobb AP, but I have to say the latest updated HyperTech is a BADASS piece of work, and is safe too. Just to give you a second option from the whole "Cobb or bust!" opinion on NASIOC.
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凛 ('Rin') - 2009 Nissan 370Z
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