its probably just your rims and tires.. i notice you have 17x9 and i just upgraded to 17x9 275's and the car pulls like a bitch over uneven surfaces.. this is known to happen when u upgrade to 17x9 from the 17x8 stock rims just my .2 cents..
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2002 Black Mustang GT 5 speed
Mods
BORLA Stingers
SLP Catted-X
MGW Shifter
Mach 1 Grill Delete/Chin Spoiler
Chrome 03 Cobra's 17x9
H&R Supersports
Waiting to install
Vortech Supercharger
4.10's
FOR SALE!!
SLP LM1 Catback, Magnaflow O/R X PM ME! 
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