The phrase "additional horsepower" refers to adding extra power or strength to something, similar to a car having more power to go faster. Full definition
Granted this is a personal preference type of item, but we would love to see a turbo - charged engine with additional horsepower in future generations. (bestride.com)
This engine is quite powerful even without performance tuning, but you can gain some more additional horsepower. (mywikimotors.com)
It's an octa - core processor Google designed itself that delivers additional horsepower for imaging and HDR processing. (engadget.com)