This mod is Mack E9 V8 Straight pipe sound for Harven's R Series, Dielingwu's Superliner, KSW's Superliner, and BPM's MH613

DISLAIMER: NOT COMPATIBLE WITH ANY SCS'S MACK TRUCKS BY DEFAULT

Latest Version Feature:
-Mack E9 V8 400-500HP with straight piped sound
-2 variants available: electric starter and air starter
-Automatically activated engine fan
-Exhaust stack simulation effects
-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

Credits:
Slav Jerry - sound samples, mixing and modding
SCS Software - few engie samples, one to be specific