I came up with a simple equation for roar legal motors:
Brushled equivalent = 2*(brushless turns) - 2
It's fairly accurate so that a 4.5 would be a 7 turn brushed, a 10.5 would be a 19 turn brushed and a 13.5 is a little better than a stock brushed motor.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy