It's an unfortunate truth that your mods will probably not increase the value of your car. In fact , modding the car will often reduce and not increase the value of your car. You have further reduced the value by voiding at least some areas of the warranty.That is one of the main reasons why so many owners part out the cars prior to selling.
Don't flame me , I am only the messenger. If you do a search you will find much on the subject.
My .02 is that you will do much better financially if you return the car to stock and confirm the status of the warranty.
Sorry you have to part with such a fine car.