A more economical series of diesels called Mack Power, or MP, will go into production beginning in early 2006 to replace current ASET engines by January '07. First is an 11-liter MP7, which will be offered as an '04-compliant engine in certain truck models. For '07 the MP7 will be fitted with a diesel particulate filter to meet stricter exhaust emissions limits. Also in '07, a 13-liter MP8 will debut. They'll deliver better fuel economy than ASET engines, and have unique mechanical parts and electronic controls.