Assuming that he bought it new (or that the previous owner hasn't changed anything, if he bought it used)...If it's a V6, then he has the 7.5 rear end and I believe 3.31 gears. If it's a GT then he has the 8.8 rear end and either 3.31 gears or 3.55 (Package option, isn't it?)
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2001 "sixxer" cobra  --CAI, tune, 3.73+T-lok, UDP
13.3 @ 104...highest trap @ 106
Looking for driver mod, lol.
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