245/55/16 are about as big as you can go on the stock rim. If you change the diameter(the middle # would affect it) then it will screw with your speedometer a little bit. Even with 245's on a non-lowered car I've heard you can have some rubbing issues so be careful. So I guess I wouldnt go any bigger than 245's IMO. As far as the Pirelli's yeah they would fit, but your speedometer would be a little off.
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92 Mustang GT, 347 Stroker(Forged Steel Crank/Rods-Balanced, Forged Aluminum Dished Pistons), Trick Flow Track Heat Intake, Trick Flow Twisted Wedge Heads w/ Stage 3 port/polish, 80mm C&L MAF, FMS 30# Inj., BBK AFPR, Trick Flow Stage 2 Cam, Trick Flow 1.6R Rockers, BBK E.L. Headers, Flowmaster Cat-Back, MAC CAI, FMS Pulleys, Griffin Alum. Radiator, MSD Pro-Billet Distributor; AOD, Dynamic 3300 Lockup Converter, B & M Super Cooler, B&M Ratchet Shifter; 3:73 gears.
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