Ecotec engine in the 2007 Saturn Ion was improved over the previous year's model: power output increased from to at 5600 rpm, and torque output increased from to at 4200 rpm. The new engine was fitted with the ECU from the 2.4-liter engine. The 2.4-liter Ecotec received a similar upgrade: power increased by five horsepower to at 6500 rpm, and torque increased from to at 4800 rpm. An "Appearance Package" was offered for the 2007 Ion 3 Quad Coupe, including redesigned front and rear bumpers, side moldings, elliptical fog lamps, and a chrome exhaust tip. The Recaro seats in the Red Line version were replaced with black leather-appointed seats, which featured a passenger-sensing system. The Ion was discontinued after the 2007 model year, and replaced in Saturn's lineup by the Saturn Astra hatchback, a rebadged Opel Astra H imported from Belgium. The 2007 Ion was the last Saturn built at the Spring Hill, Tennessee plant. Red Line Edition In production from 2004 through the 2007 Model Year, Saturn produced the Red Line Sport Compact This engine/powertrain combination is also shared with the Chevy Cobalt SS Supercharged Edition, which did not start production until the 2005 model year. The Ion Red Line features most interior features from the standard Ion Coupe, including its rear clamshell doors, to allow accessibility to the rear seat. Introduced for the 2005 model year was the optional Competition Package. Included in the Competition Package were 17" Gunmetal Painted Alloy Rims, Ladder Tachometer w/ shift lights, a Limited Slip Differential, and Optional Projector-beam Fog Lamps. In mid-2006, GM released two Engine Kit upgrades for both the Ion Red Line and the Cobalt SS. The Stage 1 Kit retailed for around US$500, and included higher-flow fuel injectors and a recalibration to the ECU to increase the horsepower by to and of torque, up from the stock and . The Stage 2 Kit retailed for around $750 and opens up the middle of the power curve to more power than the Stage 1 Kit alone. In addition to everything that the Stage 1 Kit comes with, the Stage 2 Kit includes a smaller drive belt and pulley for the supercharger, bringing the engine up to and of torque. GM did release a Stage 1 to Stage 2 Upgrade kit that retailed for $400. This Upgrade Kit is for a Red Line with the Stage 1 kit already installed. This