You can also use liftbars. Only way to go short of a lift. Liftbars, gets the car up in minutes, rock steady and safe. I have used them for years on my 928s. The boxster uses the later version.
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Ed
Pittsburgh, PA
78 5 spd 928 Blumaxx (in Hemmings S & E issue #100)
85 928S garnet red stock daily driver
06 Mustang GT Legend Lime and modified to go even faster