Not sure how much the bonnie GXP will retail for but if its as much as I'm thinking it will be - I would rather get a used Cadillac STS. At least then I'd be getting the real NORTHSTAR and not a detuned one (I think the Bonnie GXP will be akin to the Olds Aurora V8 - it's based on the Northstar but not as powerful).
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Regards,
Chew
2007 Sly Silver Pontiac Solstice GXP