I have the FRPP "P" springs with the Bilsteins. I like the quality and performance of a monotube dampener. Not sure how the springs compare to the Eibach but I have read in several places the are made by Eibach. The ride is firm but not harsh. I can't believe how much better the car handles. I went from the Brembo suspension which had nose dive when braking and plenty of bounce on certain road conditions. I used the GT500 mounts 180 degrees out and the alignment came in perfect. On the rear shocks you will need to reuse the top mount pin type rubber insulators. Make sure you cut down the rear bump stops as there is not much clearance after lowering. If you don't they will hit and make the rear more harsh than needed.
Candy Red / 401A
Glass Roof/Hood & Side Scoops
3.55's/ Comfort Pkg
Shaker 1000/Side Splitters
Rear view Camera/Ford Racing Axle Backs