Tony before I got my lift I wondered the same thing also. But, how far back does your garage door go? If like most it only goes back over 1/3 the car. The door doesn't need to clear the roof, it needs to clear the hood or trunk (based on how far back the door goes). To test this, open the door with a car inside and see what you would need to clear. I've got a 4 post lift with an 8 1'2 ft ceiling and it works fine for 2 vipers (RT/10 & 06 coupe). Both these cars have low heights, eyeballing my wife's 911 cab I can see it won't fit. The only issue I have is that the car on top has to be backed in. The door will clear the hood, but it won't clear the coupe's back glass of the RT's sport bar. If you need to know the coupe's height you can find in on-line at KBB or new car sites that list vehicle spec's and demensions. Mike