IME ... modifying the vtec engage point can add serious performace value to your car. I drive a DC5r with vtec modified to engage at 3100rpm under WOT, the torque is quite impressive compared to the mid-range torque of the stock ecu. Another difference is I have no noticable kick when vtec engages, only a very small change in sound pitch. My other engine modifications are only exhaust and intake

In my way of thinking, if there is a noticable difference in power output between 2 cam profiles when switchover occurs, then there is room to make a smoother, more linear switchover by adjusting the vtec engage point lower. Thus producing a more drivable car.