Maybe buying’s not the thing then- just lease a car so you are pretty much restricted from modifying it.
If you lease a fairly expensive car (that depreciates rapidly) and work out a good deal on payments due to credit / negotiating etc you can make out decently with a lease.
Cons are that your mileage will be limited every year and this would exclude most vehicles that are worth under $40k or so (as they would likely be better off purchased than leased).