Other changes include a new console, new steering wheel and new radio head unit that features an audio input jack. 2007: The 2.2 engine was retuned and now developed 148 hp (110 kW) at 5600 RPM and 152 ft⋅lb (206 N⋅m) at 4200 RPM while retaining the same fuel economy.In addition, as with most other GM vehicles that year, GM's Mark of Excellence symbol was added to both front fenders near the doors. The LS became the base model while the LT was marketed as a mid-range package the top level trim was now the LTZ. This provided performance of 0-60MPH in about 7.1 seconds and standing quarter time of 15.6s. This car was equipped with the LE5 2.4 Ecotec engine with VVT on the intake and exhaust and a 10.4:1 compression ratio developing 173 hp (129 kW) at 6200 RPM and 163 ft⋅lb (221 N⋅m) at 4800 RPM. 2006: A naturally aspirated SS was added to the lineup. This delivered lively performance of 0-60MPH in 6 seconds and a standing qtr of 14.4 seconds. With a relatively high 9.5:1 compression ratio and 12.0 PSI of boost, it develops 205 hp (153 kW) at 5600 RPM and 200 ft⋅lb (271 N⋅m) at 4000 RPM. Later in the year a Cobalt SS coupe was added to the line-up, fitted with the LSJ, Eaton M62 supercharged version of the 2.0 Ecotec engine.
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