"Power adders" refers to tools or devices that are used to increase or enhance the performance or power output of something, typically an engine in a vehicle. Full definition
Powering this truck is the twin turbo Ecoboost punching out 450 horsepower from the factory and has had a couple power adders including a Ford Performance exhaust system and cold air intake. (classiccars.com)
It also packs all of the Mustang GT's Performance and Premium package options into one, and it has a few power adders for its 5.0 - liter V8 engine, including a Shelby GT350 intake manifold, Open Air induction and 87 mm throttle bodies. (cnet.com)
«But due to the power adder they will require a higher octane»: this is a specific place where compression and temperature are both important. (mechanics.stackexchange.com)