In Stock for stock form, I would have to say it is a tie between the SN-95's and the 99&00 GT's. Although I think the 01 GT's look better than both of them.
Back to the 94-98 and 99-00 GT's. While I like modified SN-95's, I think the 99&00 GT's look simply AWESOME with certain body kits(Saleen, Steeda, and the Cobra R come to mind).
98 Yellow Stang... I don't know if you've seen the new Thunderbird in person, but I did and the car looks gorgeous. I think its a pretty sweet looking car Because of the blend of modern and retro styling. Not trying to flame ya cause your opinion is your opinion, but they do look great in person. Of course nothing to trade the stang for though!
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1991 GT, AOD, Moroso Cold Air, 3.73s, March pulleys, 3-chamber(the left one fell off-NO time+No Money=College), FMS c-springs, and KYBs