$500 and you can only tune a few cars. My PT was $400 and I can tune almost any '97-03ish 3800 car.
Personally, if DHP refuses to continue support, I have no qualms tuning other people's cars.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne