I had the same problem....my crossmember bolts were loose from the factory...check them.
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01 GT 12.3 @ 112mph
Steeda timing adjuster,Steeda underdrive pullies, ,steeda tri-ax 3650 shifter,24#fms injecters,bbk 70mm throttlebody,80mm maf,bassanni x pipe, Borla Side Exit exhaust, fms 4.10's, moser 31 spline axles, custom diablo chip.Steeda caster camber plates,g-trac bar,cobra r ground effects and hood,cobra r springs,ported upper intake.Comp cams #102600,fms jet hot coated shorty headers,mod max cam gears. msd 7020 Stacker 8
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