You COULD have a Dinan suspension (or if you want to AutoX in STOCK class, then shocks and front swaybar only) put on the car and SOLD to you that way. Then it would all be covered under your car loan and not out of pocket. And as it would be Dinan parts, it would be covered under warranty (Dinan's, but would be the same as BMW's). That should take care of the soft suspension for you.