Depends on the enforced rules, but if you had a small blower pop and the O-ring dislodged would keep the manifold from sealing. converting to a burst panel is not that big of a deal and you are covered if for your deal they mandate them. When they first came into play they were expensive, but now they are cheap enough thats it a no brainer. Pros change them out quite often before they blow , but stay away from used, they could be 1 run away from blowing do to fatigue