The only reason my track banned brushless, was for the guys that have all the money tied up in several motor's, lathes, brushes..... They could not use their brushed motor secrets or so called "voodoo" and dominate the track. You should have heard all them guys belly aching when me and a friend showed up last year with brushless set-ups which were legal last year by club rules.
I can see not running brushless in spec and stock class, but modified?