I just installed the Roush Rear Coil Springs on my 2006 V6. If you are looking to eliminate the rake in the rear of your car and even out your fenderwell space, Roush Rear Coil Springs are the way to go. Plus they are relatively in expensive compared to lowering the entire car. Check out the before and after pictures. Enjoy.
Very Nice. I like a slight bit lower, but many do look for this effect. Plus, I assume the ride is pretty good? Downside of the Eibach pro kit is the ride without changing the struts and shocks, which I did not. Did you make any other changes to suspension? They look good!
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09 V6 Pony Convertible Daily Driver-- Have: FRPP X pipe true dual exhaust, Eibach Pro-Kit lowering springs, Steeda camber plates, Steeda strut brace, and some dress-up stuff Next: C&L intake Bamachips combo, 4.10 gears + LSD.
I just bought a set of 4 FRPP and only used the rear, oh well...
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2008 V6 Deluxe Convertible, Torch Red/Parchment top and interior, 5-speed manual, Exterior Sport Appearance Package
Mods:
K&N 63 Aircharger Cold Air Intake, JBA Evol Axle-Back Exhaust, Hurst Competition/Plus Short Throw Shifter,
Ford Racing Performance Parts front strut brace,
Ford Racing Performance Parts rear lowering springs,
GT Vert rear anti-sway bar
I just bought a set of 4 FRPP and only used the rear, oh well...
Spring rate for the rear springs is the same V6 coupe>GT coupe
Coupe: 24.9 N/mm (142.2 lb/in)
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Xcharger with water injection, JBA headers
JBA duals with an H pipe, Roush rear springs, Che K member brace with torque limiters, Cervini's quarter window deletes, Canton polished expansion tank, Roush scoop, Street Scene Elenor grille, custom GT500 chin spoiler, PJ rear louvers, Black rear spoiler, BSM custom stripes, Hurst shifter, Billet interior trim, custom door welts, Autometer dash pod, AEM wideband, Autometer boost & Fuel pressure gauges
Newly Installed Roush Rear Springs... 
