With sportlines, you'll probably need camber bolts and an adjustable panhard rod. You should also check pinion angle.
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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
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
I think I'll go that route. Where do you install them at?
He has the prokit... the sportline has more drop. You will need an adjustable panhard with a 2 inch drop. As I mentioned, you should also have the pinion angle checked when you lower 2 inches or more.
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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
panhard rod definatly i still need to get that, instead of camber bolts get caster camber plates, my alliagnment is still adjustable but it would be alot better if u got the caster plates. if u lower the car the rear end will be a little off center, it wont throw the driving off, but its recommended to get it so the rear wheels are center. also if you dont want to worry about bottoming out get shock/struts as well, thats why i got the tokico's
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05 mustang premium v6 manual performance-dual catback flowmaster super 40's jba headers, eibach sportline springs, tockico d-spec shocks struts, eibach sway bars f/r, other mods, ccfl halos, 6k hid, smoked out, sequential taillights, roush spoiler, carbon fiber wrapped interior trim
GT Eibach Sportline Springs 
