– Western Star Trucks unveiled its EPA 2007 chassis and latest product enhancements at the 2006 Mid-America Trucking Show in Louisville, Ky. Western Star debuted its EPA 2007 chassis by featuring a 4900 EX with a Detroit Diesel Series 60 engine and 82-inch Stratosphere sleeper. The chassis’ design changes — including updated cooling packages and new exhaust systems — will be made to all Western Star truck models to meet the new emissions requirements that take effect Jan. 1, 2007.As a result of the changes in standards, Western Star’s radiator packages have increased in size. Changes made to accommodate increased radiator sizes have also enabled improvements for front suspensions. Plus, new steering gears and optimized geometry improve road feel, overall wheel cut, and turning radius. Western Star will also add the AF-18.0-5 18,000-pound steer axle to the family of axle offerings in combination with the EPA 2007 suspension updates.