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What is the device going to do? Where in the car - under the dash or bonnet? These determine the environmental conditions and thus the temperature range. If it will be required to run the car such as fuel injection, I would not skimp on the quality of the components. You will probably get away with normal regulators, but you would be sensible to add lots of decoupling and also an LC filter to keep transients and noise out. Paranoia may dictate a fuse and zener crowbar to protect against gross overvoltage, but this is probably overkill for a modern vehicle.
Feel free to post more info and I will give feedback.
Simon
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