No air suspension on your 550i.

 

This thread is worthless without measurements.

 

No the thread is useless without the OP physically looking under the car or jacking up the right rear, removing the wheel and actually looking at what's going on or not.... Get your hands dirty and put fourth a effort!

 

Well I just measured it and drivers side from the side walls to the fender is a 2 inch gap, and passenger side is almost 1 1/2 inch gap maybe less.

 

Bern.

 

If that's with nobody in the car, those measurements sound perfectly normal. I just looked back at my measurements before I installed coilovers and the rear differed by 1/2" from the left to right side with no weight in the car.

Sounds like you don't have an issue, assuming you looked at the spring and confirmed it's still sitting on its perch.

 

I just installed new Bistein Struts and noticed the driver side sits higher than the passenger side. I measured the difference on both sides and found the driver side to be 1/2" higher than the passenger side. This is completely normal.

With that said, I noticed more of a "gap" in the wheel wheel on the driver's front. Coincidentally that is the side that had the blown strut. So before the replacement, the front left had almost no gap at all. I attribute this to the strut being blown.

OP check your shocks/struts and as mentioned, your springs.

 

NOT ,!!!!!!

This is so not normal, assuming you just dropped your car after that job and not yet driven it, ther could be a difference in settling BUT if after driving the car you still have a different measurement you did something wrong with your Bilstein work. No car other than maybe a Yugo has a half inch variation between left and right by design......

 

This was a few weeks ago and the car has settled. I am on sport springs, I did not lower the car. Anyway, with someone seated in the driver's seat, it is the same height. I am not the only one who has noticed this. A google search will yield hundreds of posts with the same results on many different BMW Chassis.

" No car other than maybe a Yugo has a half inch variation between left and right by design......"

State your source or have a good day sir!!!!

 

This might be interesting for you:
BMW Workshop Manuals > 5 Series E60 545i (N62) SAL > 3 Technical Data > 33 Rear Axle > 0 General > 5 TD Rear Axle - Ride Height E60