Tesla have a very tricky issue to punish anybody to add configurations to the order when reservation period. I order Model Y in Sep with FSD ordered, and this Monday my parents questioned do we need $10000 for the full FSD. I was very tangled about whether or not to order the FSD with $10000 or just take the subscription in the future. I removed the FSD feature in the morning on my order online, and afternoon I want to add it back cause I thought it could raised price in next Jan when delivered to order that time. So I called customer service sales to re-add the FSD, and they didn't tell me it gonna change my car price as my price is in Sep. And then after the order changed to re-add FSD, I found my car price just be $4000 more! It is the same price on the latest model Y price now. I was very angry, and called customer service & go to showroom to ask for the change, this is unfair just re-add a FSD feature and it gonna charge me $4000 to change to latest price! But they said it is in the agreement, any add new configuration will be regard a latest order with latest car price, it is definitely wrong, they didn't tell me to be careful about the price may change on the confirration change when I ordered the car, or talked with sales in the online meeting, or have the test drive in showroom, they just ignored the important policy that is definitely very easy to happen when during the reservation for a long time to wait for delivery, they didn't tell me anything about the policy.