I had a black Honda Accord that the original owner (lady) had a pink pin stripe put down the sides and on the hood of the car. Needless to say I was not going to roll around like this longer than a day. So I used a heat gun and got the end of the pinstripe to come up and slowly kept going with the heat gun. It worked like that on all sides and the hood of the car. I dont think I really had to use the heat gun, but I did anyway. You could see where the pinstripe had been, But I striped the wax and detailed the car the following weekend and it looked fine.
The factory pin stripe is painted. To check, inspect where the stripe curls over the outer door panel onto the inner door surface. If it is not a painted stripe, a heat gun can remove it. However, depending upon the age of the paint, the area under the stripe will be a few shades different from the surrounding paint which has weathered.
It doesn't seem painted on. But I would be concerned with the paint under the stripes being a different color, or there being left over adhesive. I am waiting until I get a paint job done to remove the pin stripes.
I removed the pin striped on my coupe, and in some places on mine anyways it was the driver and passenger doors where the pin stripes go over is the only place where there was paint underneath. there was nothing under where the stripes are in the front and back.