Let me introduce Guangchang to you. Their family specializes in Porsche modification and upgrade, and the interior has been improved very well. Although I haven't changed it, I have been to their store to change the enclosure and exhaust, and several cars of their company have changed the interior.
New Cayenne, macan, new panamera and a 2002 Cayenne are all leather interiors, and the workmanship is really first-class.