Scania offers a full range of industrial engines—9-, 13-, and 16-L, covering outputs from 202 to 515 kW (271 to 690 hp)—available with EU Stage IIIB and EPA Tier 4 Interim certification using Scania-developed systems for fuel injection, engine management, and emissions control. The required emissions levels are achieved using a unique SCR (selective catalytic reduction) system that is similar to Scania’s forthcoming Euro 6 system for trucks, and Scania XPI common-rail fuel injection; no additional filters are required. The XPI high-pressure injection system and the engine management system are said to optimize the efficiency of each engine stroke. The company notes that developments are being completed for the next steps in emissions legislation—i.e., EU Stage IV and U.S. Tier 4 Final—effective from 2014. With only minor changes to the installation, according to Scania, the engines will also comply with these stricter emissions levels.