The new rule now defines what a "computer" is. This has not been in the rule book until now. So, since it takes a 60 tooth wheel and computes that into firing every 90 degrees, it is not legal. I have heard that they have been allowing it up until this year because the definition has never been in the book. SO all those guys that set records with awesome ignition systems, no everyone from here on out, has to use a lesser ignition system to break their record. So it makes it much tougher now. Mainly for the blown guys rather than the NA guys, since they benefit more from a hotter spark with increased cylinder pressure.