Bill w wrote:But with an scca car you have to fallow rules and the only way to fallow these rules is to do it this way.
This applies to most sanctioned/regulated race classes.
The organisers or sanctioning body (eg. FIA in europe) usually have quite specific rules about the type of cage/cell and how it has to be constructed and installed in a car/shell for this class.
These rules tends to also specify what can and can not be cut/welded/altered on the original shell of the car.
Fitting these cages/cells while correctly following the regulations set can get quite 'interesting' especially as in various cases the cages/cells can not be 'self built' but you have to buy the cage partially assembled and are only allowed to install it and finish it up.
No modifications or changes in these cases are allowed to the cage or the approval is voided making the car no longer acceptable for the class it needs to compete in. Which was kinda the point of fitting the cage