Stock the fastest ones were in 87-88. They were the speed density versions. There was no restrictive stock mass air meter to breathe through. The later mass air cars are more desirable though because drivability problems are not an issue with the mass air cars once modified.
In '93 they also went from TRW sourced forged pistons to Hypereutectic pistons.
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1988 Mustang GT
12.0 @ 122
1992 BadAzz Wrangler
1993 Explorer
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