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Intake is not going to give you much at all. It will give some nice sound though usually.
BTW this thread doesn't belong here. It belongs in the IS300 section, not stories/racing enthusiast.
most intakes will only give you 5-9 rwhp gains
so from a butt dyno perspective, it's very little
but you do get a cool sound coming from the front at wot
intakes available but in no particular order: srt, k&n, injen, aem, lms, joe_z, etc.