Honestly I assume it's stock. 182,500 miles but runs great.
It has Toyo tires.
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2000 Pontiac Grand Prix GTP: Black on Black, all stock
1987 Buick Grand National: 3.8L stock block, Billet Main Caps/ARP studs, GT6776E, 3400 Stall, 55lb injectors, LT1 MAF-Translator, Turbo Tweak chip: 516 FT-LB torque, 16# boost-93 oct