I was thinking of changing the Air Intake, until I came across a used PasswordJDM Kevlar Air Intake for a good price. Initially, I was just going for the looks and I wasn't expecting any significant performance gain... Boy was I wrong! The throttle respond improve significantly after the installation!
One thing to note though, the PasswordJDM Kevlar Air Intake is bit on the soft side. You can easily press down on the intake. Anyway, I feel that any aftermarket air intake which is shaped the same will provide the same kind of throttle respond. So if u wanna save cost, just get any cheaper alternative and couple with a good filter :)