Exhaust Bassani exhaust users...question

So I’m installing my bassani catted x-pipe. I noticed Bassani supplies these inserts at the collectors.

what are these for? My guess is these are for stock (smaller) headers and I won’t need them for my JBA shorties?

I’ll email Bassani, but it’s sat. Was hoping to install this weekend.

I’m going to remove them but I don’t want to find out I needed them

Pretty sure I’ll be fine to remove it then. My JBAs have a big collector