The BC Racing coli overs are the way to go. I couldn't be happier!
When I originally purchased them, I had never owned a set of coil overs. I did short research, and I knew I didn't want to have to deal with cutting and welding spindles. BC offered the only coil over on the market with our spindle already attached. They were pricey in comparison to other coil overs, such as Tein (but in my opinion worth the price difference not having to weld. Last thing I wanted to have to depend on a welded shock absorber setup). With what I now now, it could be reliable welded, but still...
I've been running them for over almost a year now. And I have no complaint. The quality of them seems to compliment the quality of the car. And from what I hear in the enthusiast community, they are a great coil over at the price point.
I have the front set at the softest of 32 settings (say '1'), and the rear set to '8'. The car hugs the road!
Avoid making the same mistake I made. The kit will come with the 4 coil overs with the spring for the coil over, and 2 springs that appear to replace the rear springs on the car. You don't need 4 springs in the back. The spring on the rear coil will do. I have the other two new springs in storage.
The install is easy, now that I've performed it one time. I did the job alone. Just make sure you have the tools needed.
Regular tool box with ratchets, and wrenches.
Impact screw driver to remove the disk break cover from the OEM spindle.
Ball joint tool.
Patience (lots of it)
Good luck with it. Coil overs were a great upgrade to the F50!
All the best,