We seem to revisit this A LOT, but that is one of the benefits of a forum, you can ask questions and get a ton of answers. Richard from TTS (They install awesome blowers) says it doesn't make much difference. True enough on the dyno, probably almost NO measurable difference. Seat of the pants dyno is a whole nother ball game. Most of us who are not riding on the drag strip or timing course can only judge the potential of this locomotive without rails by just wacking the throttle every now and then. The throttle response you feel then is dramatic. If you use Tune Boy to set them open 100% YOU WILL NOT feel the same thing. This is a small point but leads to a lot of confusion. The ECU reads a different map for idle, and tune boy DOES NOT set that map open to 100%. As soon as you hit the throttle (come off idle) the servo motor cranks them open to the map Tune Boy has set at 100%. But it doesn't do it as fast as you can twist your wrist. If you are on the dyno or the drag strip you are set. But for the average dork like me just screwing around from traffic light to traffic light removing the secondary plates results in a more dramatic seat of the pants response, and a little rougher time for the ECU to manage the idle, (most noticeable when it is really hot.)