This mod is 12V-71 Straight pipe sound for SCS trucks and truck mods Version 1.0 Feature: Detroit Diesel 12V-71 476-600HP with straight pipe sound Max volume regulation to reduce chance of sound flickering and prevent too loud sound (Highly recommended to put engine, exhaust, turbo volume slider to max) Featured full 3D directional sound for extra realistic feeling of sound Custom sound attenuation for realistic sound fade off and distortions Custom exhaust distortions for realistic exhaust tone Included idle jake brake system Included Customizable Additional Supported Trucks (CAST)