I have a set of FRPP struts, shocks, and two sets of springs. I understand one set to be a 1" drop and the others are 1.5" (I think)- part #'s on the 1" set are: and on the 1.5" set: If you can verify, please do!
Questions:
1. Why are the unloaded 1.5" rears longer than the 1" ones? (see pic 2)
2. Which way do the rears go- tightly wound coils up or down?
3. Does the front strut go togther as shown in pic 3? Maybe it will be clear when removing factory stuff.
4. I'm thinking about lowering the front 1", rear 1.5". Any reason not to do this?

 

First off your car looks awesome! I highly recommend that you don't put different spring sizes at the front and rear. It will look weird having 1" at the front and 1.5" at the rear, the *** will be hanging on the ground. The springs are made by Ford Racing, they know what they're doing and they don't sell them in pairs for a reason. As for your strut, yes that is the way it goes. The tightly wound coils go at the bottom.

Here's mine before and how mine looked after with 1.5" drop all around.




Here's a great how-to guide by TacoBill that I used for mine too.
http://mustangforums.com/forum/2005-...ll-w-pics.html

 

The difference in the length between the two springs is that one set is progressive rate and the other isn't.

The ones with all the coils close together are the progressive ones, they will ride better.

 

I don't see how the back would be too low as the car already has a 1/2" of rake- 1" in front and 1.5" in the rear will make it level!

Now it might make it understeer...