What's the best sleeper car, or best car to turn into a sleeper car?

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My choice is not necessarily a sleeper car from the factory, but I would turn it into the ultimate sleeper. I would get a new Mercedes E63 AMG Wagon, the one with the AWD, because it's faster off the line. I would then de-badge it completely, and install E250 Bluetech badges. I would also paint the brake calipers black, as they come in red, and I'm not sure, but I might remove with double exhausts as that gives the rest of it away, at least to someone like me. I think the Germans see a market for something like this because of the rumored "Business Package" that deletes all the go fast parts on some AMGs.

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