"Performance mods" refers to modifications or changes made to a vehicle, equipment, or computer system that improve or enhance its speed, power, efficiency, or overall performance. Full definition
For those interested in performance mods, the key metric to pay attention to is the amount of power gain across the RPM range of your vehicle. (mechanics.stackexchange.com)
BMW promises increasing levels of drama in those two modes, at least when it comes to the soundtrack, as actual performance mods for the X4 are not on the menu. (autoweek.com)
As inappropriate and ludicrous as the concept the Ford Mustang Shelby GT350R is — an all - American muscle car that's been treated to some European - like performance mods to make it suitable for tracks, not drag strips — we're still very glad it exists. (evo.co.uk)