This mod is Cummins Signature 600 Straight pipe sound for SCS trucks and truck mods Latest Version Feature: Cummins Signature 600 with straight piped sound 3 stages jake brake Gearbox whine sound Realistic turbo behavior Realistic fan behvaior Max Volume regulation for reduced chance of audio clipping and sound cutting (Highly recommended to put engine, exhaust, turbo volume slider to max) Sound attenuation effects for realistic sound fade off from the distance Sound distortions and directional effects for realistic distortions from different positions around the truck