i understand that they practically the same drop, but are there any significant differences in ride quality.

if i go with frpp they will be the Ford Racing N springs, idenitcal to the k's but designed specially for the 6. i haven't seen any threads concerning these n springs that is why i'm a little cautious. has anyone had these installed that can give some feedback on them?

 

Same spring, different box (and color).

 

now where can you find them the cheapest is the other question

 

well the frpp's seem to be significantly cheaper than eibachs everywhere, would it be logical to just purchase the frpp's?

is eibachs price higher because of the name?

 

Im assuming the same... so do you want name for more $$ or same functionality for less $$$$....

 

for everyone who has lowered there car, will i be needing anything else besides the springs. i plan on replacing the shocks and struts down the line.

 

a lot of people have been saying to get a panhard bar to re-align the center of the rear.

 

You don't *need* an adjustable panhard bar, but your axle will be off-center unless you have one. The Shelby GT does without one, so it's not going to hurt anything, but the back end won't be aligned and will feel more unsettled than if it was centered correctly. Also, depending on the drop, you'll need some sort of camber adjustment so that you don't wear the inside of your tires too much. You can either get camber bolts for like $40 or spend $250-300 for some Camber plates that allow on-car adjustment and replace your upper strut mounts. More important than anything are the dampers, but you said you are already going to be switching them out down the line, so you're fine in that regard.

EDIT: One last thing, get a good alignment.