Rollcages and rollbars are not a requirement for the IVA test. I will be getting a full cage made for me and fully welded onto my chassis in the next few months once I have the funds together.
From what I have read, a rollcage should not cause any extra issues for IVA, as long as any projects on it have the correct radius, so if you were to bolt it on then you will need bolt covers etc.
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