Would you be interested in trading for a like new set of Rotiform SPF's and tires? 20x8.5 and 20x10 with 255/40/20 and 305/35/20 Hankook RS3's. Setup has less than 500 miles on it.
My apologies. Here's the link with the description:
SP009 - Lowering Springs, Set Of 4, 1.5" Drop | 2005 - 2014 Mustang | Lowering Springs | BMR Suspension - High Performance Suspension & Chassis
HI Shaye, yes, they are what would be considered a progressive spring. The spring rates are linear. Here's a pic of them installed I stole from Google. I never had them on my car. I bought a set of drag springs before I ever installed these. They are a 1.5" drop