how do i know if my car has a sport pkg

Sport package - can't really comment on, although I think a tell tale sign is the wheels and tires on the car. RepairPal has a great article about tires - check it out: http://repairpal.com/buying-car-tires-when-where-and-how

if your tires are kinda like 19" is a good indicator and if you have nicer rims than the regular ones then that's another indicator

Different sized tires, back tires wider,lumbar seats, tighter steering suspension,