Check out the EBoost2 also. Several Cobra guys are using it and going low 8's. Very nice features on it at a better price. You can also do boost by gear with the EBoost2. To do boost by gear with the AMS, you need to have soem custom elecronics made. Not sure about boost by speed with the AMS.
I have one sitting ready to go in... they are awesome units once you get them sorted out you can do anything you want with them. Adding C02 also opens up a huge ball game for boost play.