There is 3 different versions of the 555, a 275hp, a 320hp and a fantasy level whopping 640hp. This is a v8 with a peak torque around 2200 rpm and a limit at 3000. This works on ALL SCS trucks, because not everyone has/likes modded trucks, but most people really dislike SCS engines. Also works on the following trucks: Autocar AT by XBS Autocar DC by XBS Brockway by KSW Freightliner FLB by Harven Freightliner FLC by XBS Freightliner XL By John Ruda Kenworth K100-E by Overfloater Kenworth W900 by John Ruda Kenworth W900A by 4k Kenworth w900B by GTM Kenworth W990 by Harven Mack F700 by KSW Mack RS600 by Harven Peterbilt 359 by RTA Peterbilt 389 by John Ruda Peterbilt 389 by Viper Project 3xx by HFG(Guidot) Peterbilt 567 by GTM Scot A2HD by Smarty Mod updated to 1.44 Credits Serialblack