I'm installing an eibach Sportline kit on my '06 GT. Does anyone know if the struts are pressurized?

 

they won't 'pop' out at you but they do extend over the matter of a few seconds. If you puncture them they could injure you too but then again they're pretty thick so unless you're trying to do that, you won't accidentaly do it.

The existing springs though have some potential to do some damage. Be sure to use jack stands and a floor jack. Jack stands to support the vehicle and the floor jack to release the tension on the springs by dropping the Front A-arms down or the rear diff down.