In the testosterone-propelled world of motorsports, Bianca Bustamante has shattered the gender barrier and made Filipino enthusiasts roar more than once in astonishment. While most teenage racing drivers transition from karting (with lightweight karts, or go-karts, on short courses averaging 1,100-1,200 meters long) to Formula 4—narrow passageway to the professional league—Bianca headed straight to F3…