This mod is Mack 672ci ENDT and E6 engine straight pipe sound for Mack R Series by Harven, Mack Superliner by Dielingwu and KSW, Mack F700 by KSW, and Mack MH613 by BPM Version 1.0: Mack ENDT 673, ENDT 675, E6 and E6 maxidyne (EM6) 225-350HP with straight pipe sound 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 Equal loudness contour and slight distortion simulation to simulate human hearing Included Customizable Additional Supported Trucks (CAST) in the mod