Everyone, I've got a 03 GT and I upgraded to the Cobra front braking kit. At around 50-55 MPH I have a front-end vibration that will not go away! At higher speeds it disappears. Before I put the Cobra kit on I never had any issue in the front but now it's there and won't go away. I looked at everything and I even spent needless money at Goodyear, and Ford but they were unable to correct the problem. Stock wheels and tires, front end lowered with Steed Sport Springs. Any suggestions or advice wound be appreciated.