Although there are adjustable lower cross members available as part of the chassis stiffening kits, the IPSO piece is non adjustable. It sits between the forward rear a-arm bolts, on a lift or ground there should not be a lot of flex at that point as the frame rails are confined by the rear crossmember. Access and maneuvering definitely easier with the car in the air. I cut my support out with a sawzall, car on jack stands, engine in the car. If you have a 9-10 quart pan you'll need the removable parking brake bracket as well to allow the oil pan to be removed.
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