
The Install:
The install of these springs took approximately 5 hours. It involves removing all four coil over (spring and strut assemblies) from the vehicle. Each coil over plugs into the EDC system which makes the removal and install of the strut assemblies a bit tricky, especially in the rear where you need to access the top of the strut from under the rear deck tray. You must remove the rear tray and some trim pieces to access the the EDC harness and the 3 bolts holding the strut.
The most difficult and time consuming part of doing the spring install is making sure there is ample room to remove the rear strut assemblies without damaging the EDC harness on the strut its self or anything around it like the electronic emergency brake. We found the best way to do this is to disconnect the rear upper camber arm, remove the rear sway bar links with electronic emergency brake and disconnect the rear control arms. This gives plenty of room to pull out the coilover strut out of the rear wheel well. Other than that the install is relatively straight forward, the front is basically just like most other BMWs.
The springs lowered the car exactly 1 inch in the front and a little over ½ inch in the rear giving the car a great stance with a small amount of rake. We love the look of the car with the H&R sport springs, we also add 15mm H&R Spacers to bring out the wheels and tires giving the car a bit more of an aggressive stance on the stocks M6 20" wheels.