This mod is CAT 3408 engines with straight pipe sound for some SCS truck and a bunch of truck mods Version 1.0 Feature: This mod include: CAT 3408 T Direct Injection 400HP CAT 3408A TA 450HP CAT 3408B TA 500-540HP CAT 3408E TA 585HP and 700-800HP tuned with straight pipe sound -Replaced jake brake with CAT brake saver -New Improved sound attenuation for realistic sound fade off and distortion effects -Custom sound orientation for realistic sound from different angles -Custom exhaust distortion for realistic exhaust tone depends on throttle pressed, rpm and works along with sound attenuation -Included Customizable Additional Supported Trucks (CAST) in the mod