Just concidering some options

could you swap the motor, drivline and everything else in the car out of a 94-97 wrx wagon into a 94-97 rx impreza sedan?

any help would be great, and also if anyone might have an idea of cost?

well if its as insane as you say it is. why not.

having trouble registering the car?

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deadly treadly

na the car has been over the pits, i think the guy must know someone there and pulled a dodgy.

About the only thing that won't fit is the back seat, cost would depend on how much you are willing or able to do yourself.