SpeedyJoe

I'd like to stiffen my suspension without lowering the car, as far as I know are the performance pack springs stiffer than the stock ones?! What is the difference and does any one know if all 4 are different?
Does any one have the part no. of them? I'd like to get a set to improve my set up in combination with the eibach anti roll kit!

Siber Express

You can look for the tag on your own rear springs to see if they match, those are the #'s for my Car on Fordparts.com. I do know the front spring are out of a 2007 Shelby originally.
The front Struts and rear shocks are different as well.
Front Spring # BR33 5310 D
Rear Spring # BR33-5560-C

SpeedyJoe

Great! So I figured only the front spring and the sway bar differ from the base model.

Siber Express

Yes spring wise. The same rear springs are used on all but the Brembo, Boss and Shelby.

SpeedyJoe

Is there any option for the rear? I'd like to improve also the rear but without lowering, at least not more than an inch.
For the sway bars I prefer the eibach kit instead of using the Ford sway bars, that's just a better value for the money!

Siber Express

I still plan on doing a .8/1.2 drop on mine in the future, probably go with Koni Sports and Vogtland springs.
This is a 1/2 drop over the stock Brembo rear Springs. not sure if it sits lower factor than the rest http://www.brembo50.com/Default.aspx?pageId=1200846

SpeedyJoe

I finally ordered a set of performance front springs from fordparts.com. Hope they send the correct ones because on the it says 5310M instaed of 5310D of the order review page. Does anyone know if that is correct?

SpeedyJoe

I figuered it is just the part no. they are using, so it is the correct one.

Siber Express

Someone else ordered the Replacement springs and it was 5310 M instead of the D.

SpeedyJoe

Was there any difference? Are they better than the stock springs, do you know?

Siber Express

He was doing the same thing as well.