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yeah the uppers should be fine. Im running all stock upper and megabite lowers with a 245-55-16 street tire runin 1.8x 60ft but i spun the tires through first and second to heat them up and i was only makin 301 hp at 5600 and 311 torque at 4600.
with those tires and that much power 1.6s aint a problem if they got heat in them.