Has that not upped the price of the car to the new book price? It would have in the past.
No it didn’t alter the price of the base car. After hearing about past experiences of others on this site, I was very careful to ensure that the base price wasn’t updated to the new Performance price! I had it in writing via email first that Tesla would categorically not update the base price if I simply added EAP to my order via Tusker. I then used that email to contact Tusker, who simply added it and emailed Tesla with the new PO. This all went through fine... I checked with both Tesla and Tusker.
Hope this is useful to you and others considering adding EAP to your order, or salary sacrifice / lease.