Microsoft Flight Simulator X contains Red Bull Air Race missions where the player flies an Extra 300S through a race course and makes use of Nitrous Oxide injection for the engine. While I have heard of NO injection for automobile engines, I have never encountered an aviation engine which made use of this. Can anybody verify if RBAR teams make use of this?
This is from the 2014 season
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.
Here's a link to a smaller engine using nitrous to get 300 HP out of a 100 HP engine for record setting purposes
and even more HP here