94+ were the sn95 bodystyle, 79-93 were foxbody.
86+ started fuel injection which was speed density, in 89 they went to mass air.
87-92 mustangs had forged pistons, 93-95 gt's have hyperneumatic (sp.) pistons.
Nothing wrong with 93+ engines, the factory pistons tend to get weak under lots of boost, usually can handle more than a streetcar needs though....any more questions? i know my 90 was the first year without tilt steering  
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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