This mod is CAT C15 ACERT engine with straight pipe sound for some SCS trucks and a lot of truck mods Version 1.0 Feature: -CAT C15 ACERT 435-625hp and 650hp tuned engines with straight pipe sound -Realistic turbo behavior -Realistic intake behavior -Custom sound attenuation for realistic sound fade off -Custom sound orientation for realistic sound from different angles -New Improved exhaust distortion for realistic exhaust tone depends on throttle pressed, rpm, intake pressure and works along with sound attenuation -Included Customizable Additional Supported Trucks (CAST) in the mod Quick tutorial on how to use CAST 1. Goto def/vehicle/truck/ 2. Rename one of zcustom_xx into truck def name you want (optional but should do) 3. get inside that folder/engine/ 4. Open every c15a_xxx.sii files and look at line 3 5. change “c15a_xxx.custom.engine” to “c15a_xxx.(truck def name).engine” for every files in that folder and you should good to go Credits: Slav Jerry – sound modding and samples SCS Software – engine samples LoaderSaints – CAST idea