International WorkStar heavy-duty vocational models will include SCR for 2013. The company’s 13-L engine with Cummins Selective Catalytic Reduction (SCR) after treatment system are included as well. Features 96-in. break-away mirrors and standard LED lighting. The 107-in. bumper to back-of-cab WorkStar tractor is available with a proprietary 13-L engine with SCR with up to 475 hp and 1700 lb.-ft. of torque. Navistar Inc.