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I look at safety gear as a system. Whatever you choose make sure it will perform well with all other gear to work as designed. Example: Adding a harness without race seat risks spinal compression in an accident. Harness without HANS puts your neck at risk (see Dale Earnhart Sr.).

3 suggested levels of protection:

Full street car for occasional DE- BK roll bar extension, stock seats, stock 3pt belts, CG lock, fully operational airbags.

Dual purpose street car for DE/Time Trials- BK roll bar extension, racing seats, 3pt belts, CG lock, fully operational airbags, fire ext.

Full Competition car- Full cage, full containment racing seats, racing harness, HANS device, window nets, arm restraints in open car, fire suppression system, airbags removed.

There are lots of other possible combinations but most leave you exposed in one way or another. Check with your club safety marshal for further guidance. Choose your safety gear wisely.