BBK 2501 Lowering Springs Kit - Performance Progressive Rate Kit for Ford Mustang V8 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 Specific Spring Rate Offers Slightly Stiffer Ride Over Pregressive Rate But Still Retains Good Ride Quality Direct Replacement for Stock Springs these BBK Lowering Springs Offer Improved Car Stance for Improved Looks