Yes, get the #4 kit. That's what I got. It also comes with a new dampener, you'll need it. Otherwise, at least get the dampener separate. Mine had a nice groove in the stock one on the 103k mile engine, and the XP cam will wear it even faster.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne