Big price difference between a GTP and a 'Stang GT. If you can afford the 'Stang and winter driving isn't a consideration, get it. Power is easier to make, addons are cheaper, and usually the service bill is less due to the RWD engine and transmission layout.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne