The term "engine mods" refers to modifications made to an engine in order to improve its performance, increase power output or enhance its overall efficiency. These modifications can involve altering various components within the engine such as changing the exhaust system, modifying the intake manifold, adjusting the fuel injection system, and even rebuilding or replacing parts of the engine altogether. The goal is often to optimize an engine's performance for a specific purpose, whether it be for increased speed, better gas mileage, or improved torque. Engine mods can also involve alterations made to improve the appearance of the engine, such as adding custom paint or changing the exterior components. Overall, "engine mods" refers to any changes made to an engine in order to enhance its performance and functionality.