Here's the ramair II bird that put everyone on notice a dozen years ago in the stock class.
Since then there are several that run 11's in this class currently.
Since you aren't competing with rules and skies the limit, you could technically compare to the FAST class, which has had one in particular max effort dip into the 9's, with the long branch manifolds.
https://youtu.be/KWR0IBTtG80
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2019 Pontiac Heaven class winner
https://youtu.be/XqEydRRRwqE