http://straightpipe.ca/forums/showthread.php?p=29763#post29763 (http://straightpipe.ca/forums/showthread.php?p=29763#post29763)
That's a good thread. Interesting responses too. See the comparison about with and without restrictor plate at Road America ;)
http://mazdaracers.com/topic/4706-open-letter-to-potential-and-beginner-spec-miata-racers/
I agree; the Traqmate was the best change I made to my car this year. I found the instant feed an invaluable tool for getting faster; try something in a corner, glance at the minimum speed, see if I've lost or gained time once I'm most of the way down the next straight.
Chris