[DR 86]

Just keep your stock parts and change back to stock if you need anything serviced under warranty. They can't prove anything if you return it back to stock. I did all my mod work myself so I know how easy it is to return bolt on parts back to stock, but even paying your local mechanic for labor will likely be more cost effective if you ever did need to have anything major serviced under warranty where you're worried the dealership would deny your claim.