It works fine. Since it removes coils, each remaining coil will have to flex more to give you the same travel as before, and therefore it will be effectively stiffer, and ride a bit harder.
Cut no more than a 1/4-1/3 coil at a time, then reinstall and bounce or drive. If more lowering is desired, do it again.
Rears are easy to do this, fronts are obviously more difficult.
Measure the ride height at the fender at all four corners before you do this!
I have FRPP lowering springs in one car, and cut coils on the other, and both seem to ride ok to me.
Use a cutting wheel to cut, a saw takes forever. If you cut too much, get new isolators to raise it slightly.
I've done it and its not as bad as some say. Not as good as buying nice QUALITY lowering springs like Eibachs etc. but better than alot of cheaper springs like Intrax, or Jamex or things of that nature. Those WILL ride like a "log wagon". Im not patient enough to do the 1/4 coil at a time thing so I just lopped a full coil. Got fairly low, would probably only go 1/2 at first. Now while this does lower your car, it will ride a bit stiffer and doesnt do much to improve the handline but it doesnt make the car any more dangerous that it was to begin with unless your shocks/struts are worn or something like that, in which case the springs dont have much effect. I would still just buy some nice springs to start with since its not a fun job to do more than once.
