Cummins ISM Straight pipe sound 1.0 1.44

This mod is Cummins ISM with straight piped sound for SCS and modded trucks

Version 1.0 Feature:
-Cummins ISM 280-500HP with straight piped sound
-Custom sound attenuation for realistic sound fade off with distortion effects
-Custom exhaust distortion for realistic exhaust tone and works along with custom attenuation
-Custom sound orientation for realistic sounds from different angles
-Realistic turbo behavior
-Included idle jake brake system
-Included Improved Customizable Additional Supported Trucks (CAST) in the mod