Nismo too. My .02 cents, the Stillen is best if you're not planning on tuning as it's design tricks the stock MAF sensors to make more power by leaning out the A/F ratio. Otherwise, the others like Z1, AAM, Nismo are just as good if not better when a tune comes into play.
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'13 Audi RS5 Misano w/mods-The Red Mist
'13 G37 IPL-SOLD
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