3 link with a Y upper

[BillyShope]

Why would you want it symmetrical? That would mean tire loads that are far from symmetrical as you accelerate. With an asymmetric suspension, you have the choice of dynamically cancelling some or all of that driveshaft torque effect.



And, of course, any setup can be made adjustable if you like. But, the "why" question reappears. For dragracing, 100% antisquat provides the minimum of oscillatory loading while, for autocross or road course, it is only necessary to find some reasonable value (less than 100%) which provides enough vertical force for cancellation but not so much that it will trigger wheel hop during braking.
http://www.racetec.cc/shope