I have the FRPP-P Springs as well. Ride quality is pretty good, drops it an inch, won't give you the slammed look. If roads in your area are kinda rough, these are a good option. I have heard people with the FRPP-K springs hit the bump stops a lot on rough roads. I installed them myself in about three hours with a couple of jack stands and a floor jack. Make sure you have an impact wrench to break the nuts loose on the struts at the brake assembly.
2010 Red Candy Metallic GT
3D Carbon Eleanor Grille, Steeda Tuned, FRPP-P Lowering springs, J&M aluminum adjustable panhard bar, Steeda Pro-Action Shocks and Struts, GT500 Strut mounts, 20" Charcoal AMR's, AirRaid CAI, Flowmaster Outlaw axle backs.