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Basic standalone systems cost about $3000 to start. If you want one to run a relatively new car your probably going to have emissions problems. They really are designed for racing, and off-roading, and it's generally kinda hard to beat the fuel economy of the stock ECU without breaking things. Running rich has a tendency of causing carbon buildup, so if they can they'll run a hair lean once the car is warmed up. They can't run too lean without causing knock and NOx problems. They only thing you could really do, and make significant headway would be if you physically modified the engine, and needed a tune to match your new engine parameters. Such as if you put atkinson cams on a regular car which would improve fuel economy significantly, or if you upped compressions, or you were going to run ethanol only, or something like that.
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