BMW E9 Complete Coilover system

E9 Street or Race Coilover kit, (uses EXISTING strut housings on your car)  THIS KIT INCLUDES THE FOLLOWING:  2 Koni single adjustable strut inserts, Custom valved for GC, bolted into your existing housings Koni Single Adjustable Front Strut - Struts are externally adjustable from underneath the hood, even with the factory strut brace. This strut is prepared for coil over use, and eliminates machining of critical suspension components. Ground Control Threaded Sleeves - This system is designed to eliminate stress risers caused by machining notches into the strut housing. Unlike other companies that claim superiority by cutting threads into a critical component of the suspension, Ground Control uses engineering common sense to maximize the strength of the suspension. Ground Control Adjustable Spring Perch - A unique design, that uses an allen head bolt to clamp the single threaded perch into the correct position. No secondary pieces are needed to "jam" the threaded perch into positio