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...I'm not completely sure, but it sounds correct. Are you refering to the Astra VXR? The Aura is actually a Vectra, based on the enlarged version that is used for the Malibu Maxx and Vectra Estate. So the engine differences would be between a turbo-four and a regular V6.
The V6 in question is a pretty good engine here in the US, and it is also used down in Australia in their Holden lineup as well. 250-ish BHP is the norm, but they are adding direct-injection soon, and power is said to jump to nearly 270 BHP. Of course, being that it is an American engine, its more about torque than horsepower, but it really does a good job as a multi-purpose V6.
The V6 in question is a pretty good engine here in the US, and it is also used down in Australia in their Holden lineup as well. 250-ish BHP is the norm, but they are adding direct-injection soon, and power is said to jump to nearly 270 BHP. Of course, being that it is an American engine, its more about torque than horsepower, but it really does a good job as a multi-purpose V6.