BBK 2547 Lowering Springs Kit - Performance Progressive Rate Kit for Ford Mustang GT BBK is your Number One Aftermarket Performance Brand in the USA - American Designed and Built These Springs are Engineered in Conjunction with Eibach to Offer the Best Handling and Ride Possible for your Car Each Spring Set When Installed Will Lower Your Car Approximately 1 1/2 Inches All Around on Most Applications Progressive Spring Rate Still Retains Good Ride Quality with Improved Handling and Performance Direct Replacement for Stock Springs these BBK Lowering Springs Offer Improved Car Stance for Improved Looks