I have a friend who does a tinting business, he's been in it for years and that's all he does, along with vinyl. Most cars he charges $160, with lifetime on it. He's more expensive than some people around here, but he does good work.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne