Ben,
Okay, I guess you're referring to this language...
17.1 AUTHORIZED MODIFICATIONS
The modifications defined in the Prepared Category Section are the
only allowed modifications. The rules in this section stand on their
own; they do not build upon the Stock or Street Prepared Category
rules.
Modifications shall not be made unless specifically authorized
herein. No permitted component/modification shall additionally
perform a prohibited function. If the rules do not specifically authorize
a modification, it is not permitted.
A. It is not permitted to make any changes, alterations, or modifications
to any component produced by the manufacturer, unless
specifically authorized by these rules.
and since there is no language specifically addressing ECU mods, then it's not allowed
Given all the other mods to the engine that are allowed, this doesn't make a whole lot of sense...
-Bill