PRECISION CHASSIS**** WORKS************ - HOME
Have a look at the pictures of Kent's specBox roll cages and you will know there is no comparison between these and a bolt in cage.
Kent did my SpecBox and it is a work of art. Provides double bracing in the roof and rear sloping plane, is attached solidly to the chassis in multiple places and ties the entire A pillar into the structure. The result is a much stiffer chassis and I suspect the ability to withstand enoumouse accident damage (never tested).
For a dedicated track car I cannot imagine why you would skimp on a what is probably the most important upgrade.
Having said that my 70 911 which is used primarily for the Targa Newfoundland and as a sunday driver otherwise has a stable energies cage and I am very impressed with the fit and quality. I went that way because I wanted to be able to remove the front half of the cage 11 months of the year. I did weld the rear half in.
Laurie