Vtec contoller isn't bad, like the Apexi VAFC or the fields one, but the thing with those is if u have a bunch enigine work done then it makes a difference and they have there limitations, as for your stock set up your vtec kicks in at about 4500 rpms, but u really don't hear till u have the second runners open up @ 6000k. I have a apexi VAFC that i am going to be installing in a couple weeks along with my cam gears, and gettin it dyno tunned.. (01 GSR comptech ice box, comptech headers, skunk2 cams, skunk2 intake, apexi N1 exhuast.)