This mod improves the proformance of all the scs engines in all the scs trucks... They will accelerate faster...They will have better climbing power and better top speed.. Nothing to buy. It works upon activation. Place above all truck mods as they may have conflicting files. Update: 11/13/21 The power of the engines has been adjusted to try to get rid of the lunge that can occur from the engine being to high power. It now also opens all engines at lvl one. The idle RPM's on all engines are lowered to 500 RPM's I have tested on both v1.42 and v1.43 bata.