IDK, depending on the mileage of the car and how new the parts are, you'll know if it is worth it. Personally I wouldn't get a car with major upgrades simply because I don't know who he took it too, if they were done right blah blah blah. Better to know I did it, and that's another thing, You can't say you put all that in there when you show people your car... even though I know some people that do, and that's pretty low.
ehh just my opinion