Instead of conventional coilovers, the BBi Autosport 993 has this innovative and really trick rocker arm suspension. Instead of conventionally located shocks, push rods work the internally mounted shocks through rocker arms.
The rocker arm pivots and lower mounts are sturdily incorporated into the roll cage.
Usually, on most custom cars we see and even some race cars, rocker arm suspensions are designed improperly with the linkage in falling rate, this means that the more the suspension compresses, the leverage in the shocks increases so the wheel rate decreases, this is the opposite of what you would want! Many times the motion ratio as a really logarithmic curve where the wheel rate ramps up or falls off really fast as well. This makes it almost impossible to tune the suspension and balance the chassis. BBi carefully designed the linkage for a gradual close to linear rising rate. This is how we would do it as well.
You can see the stiff and well-supported mount for the shocks integrated into the roll cage.
Ohlins TTX 36 4-way adjustable damping, through shaft shocks are used. The shocks shaft passes entirely through the shock body so it does not displace fluid and generate gas reaction force. Because of this, only a small amount of gas is needed, just enough to allow for fluid expansion with heat and to keep the shocks internals pressurized to reduce cavitation. With only a small gas volume necessary, the shock’s reservoir is coaxially positioned around the shock body to keep things nice and compact.