Are you considering a wrecked M6 because you are looking for a deal or because of budget limitations? If it's the former than have a reputable BMW specialist shop do a thorough PPI and make your decision afterwards. If it's because of budget then run, even if the wreck didn't cause too much damage the running costs can be astronomical. You could very well spend more than $30k in maintenance/repairs over a couple years, based on the age and mileage.
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