2003 Cobra high speed vibration

New to the board I have a 2003 cobra at about the speed of 120 a very nasty vibration comes in, the car has 22000 miles (I however just purchased). A friend of mine also has a 2003 with the same symptom with only 13000 miles. So far we have ruled out tires/tire balance.
Help.

How did you rule out tires and tire balancing? Check to see if any suspension parts are showing signs of wear.

New to the board I have a 2003 cobra at about the speed of 120 a very nasty vibration comes in, the car has 22000 miles (I however just purchased). A friend of mine also has a 2003 with the same symptom with only 13000 miles. So far we have ruled out tires/tire balance.
Help.

LOL how often do you drive at 120? if it doesn't happen at lower speeds, i wouldn't worry about it. if you must, though, check suspension components for looseness or wear. also, check out the driveshaft and universal joints.