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I agree with 1niceride, stop wasting money on intake/heat shield/S-AFC. The total would cost you over $1000 including tuning and installation. Not worth the money IMO.
In my writeup, I described why people opt to get intakes. Remember, not every GS owner is into 500rwhp. Most owners, like ClubLexus members, want to fix up their ride to look "nice".