Select the Cummins N14 engine. This mod can be used on: Kenworth W900 Kenworth W900 by John Ruda Kenworth T680 Kenworth W990 GTM Kenworth T800 GTM Freightliner FLB by Harven Peterbilt 567 GTM Peterbilt 389 SCS version and Viper's last version for 1.37 Peterbilt 579 Peterbilt 387 International Lonestar Kenworth K100 There are 4 engine variants: 330hp 370hp 400hp 430hp thanks for kriechbaum for the base sound.