Shortened Front Strut Housings Options In the drop-down menu next to the image of the product, please select from the following choices: Select Option "1" = This kit uses your existing stock length housings. OR Select Option "2" = If you would like instructions on how to shorten your strut housings and do it yourself. OR Select Option "3" = If you would like Ground Control to section and powder coat your strut housings. (removal of stock spring seat and welding optional for added tire clearance and range of adjustment, directions included) Expected ride height change from 0 to 2 inches. Lower than 2 inches can cause rear alignment problems, but an M5 can go a bit lower by virtue of the adjustable subframe. Ground Control Coilover Kits This coil-over kit gives you the option to customize the ride height of your vehicle. After several years of use in racing applications, Ground Control spring kits have been adapted for street use. Most other spring kits offer only one set ride height when installed. The Ground Control system's unique design allows for easy adjustment. Simply lift the corner(s) of the vehicle that you wish to adjust and spin the adjustable spring seat up or down to raise or lower the vehicle*. Ground Control spring kits are also designed to be used with either stock or aftermarket shocks. Springs: All of our ride height adjustable kits now exclusively feature Ground Control springs, manufactured by Eibach USA. A broad selection of street spring rates are available. All Eibach / GC springs offer a lifetime warranty against spring rate change and sagging. Adjusters: All adjusters consist of a threaded sleeve and adjustable spring seat. And are made using high strength 6061-T6 aluminum; anodized for greater durability and appearance. The threads on the adjusters are square cut which locks the adjustable spring seat in place under load. For further precaution, a setscrew in the adjustable spring seat can be used to secure adjustment. Upper spring perches are used to insulate the spring. Rear upper shock mounts: Billet aluminum rear upper mounts eliminate the failure prone stock pieces. On the e28 M5, they also eliminate the nivomat suspension, to allow an adjustable shock. Bumps stops are provided and assembled. Urethane upper spring pads are used to insulate the spring. Bump Stops: This kit includes four Ground Control bumpstops, designed and manufactured for GC, and matched to your springs. Camber Plates choice: HYBRID Camber / Caster Plates: A special version of our camber/caster plates, toned down for dual-purpose cars. Uses a proprietary upper perch with a urethane spring insulator. More camber adjustment than stock, caster adjustment, aircraft bearings, engraved with calibrated degrees. Every component is anodized or plated, including fasteners. Adds extra travel to avoid excessive bottoming out, this is a very well engineered product. .Camber and caster are separately adjustable by sliding the mounts, without removing any components from the car. The Ground Control Hybrid plates feature two sets of bearings, a proprietary bearing, made to our specs by Aurora in the USA, which allows for articulation of the shock shaft. This spherical bearing is very understressed, as the GC design does NOT support the weight of the car on the spherical bearing. Instead, the weight of the car is supported by a completely separate articulating needle bearing, which is also manufactured for Ground Control in the USA. Street / Sport camber caster plate:No metal to metal contact. Urethane center bushings, molded of 88A specifically for Ground Control, with separate sealed roller bearing for steering. Marked for centered camber, and caster adjustment limited to stock (street) specifications.. The shocks and struts in this kit are not the standard off-the-shelf Koni struts for the e12/e28/e24. The front struts are adjustable from the top, and are shortened with special valving designed by Ground Control. The rear shocks have a slightly more aggressive, but still streetable damping like the front strut inserts, and are also adjustable from the top. PLEASE REFERENCE OUR FAQ ABOUT HOW TO SHIP YOUR STRUTS TO US!! CLICK HERE FOR INSTRUCTIONS ON HOW TO SEND YOUR HOUSINGS TO US DIY INSTRUCTIONS
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