If you want to tune vehicles other than a 3800, they're a good choice. If you're dedicated to the 3800 (can tune any model) and want to pay $100 less, plus get the external data logger for free, get a PwerTuner
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne