Pretty sure Brian meant SP for using prequal site, not applying after being prequaled. The Amex prequal site, as well as most if not all prequal sites, are SP only.
Sorry Brian, not all prequals are sp. There are members who have gotten prequalified and still hit with a hp. Profiles help determine whether one gets a sp or hp and i would always caution when soliciting credit to expect hp and be happy when its sp