Isso é da temporada de 2014
In previous years, the race teams were allowed to modify their aircraft, but since 2014, the engines and propellers have been standardised for all teams. The Lycoming Thunderbolt AEIO-540-EXP engine and the Hartzell 3-bladed 7690 structural composite propeller have both undergone rigorous testing and have performed to specification.
Aqui está um link para um mecanismo menor usando nitroso para obter 300 HP de um mecanismo de 100 HP para fins de configuração de registro
e ainda mais HP aqui