Elise S2 Require Rollbar?

[tang-o]

This post is old https://forums.comscc.org/viewtopic.php?t=1004 and unclear.
So I will ask probably a common question by now. Sorry.

Do I need a rollbar in a Lotus Elise S2?
Installing a bar for harness and HANS is in my radar, but no a rollbar.

Thank you
Cheers,
Emilio