The P180 is on the banned aircraft list.
That list is absolutely hilarious! What a shame that it'll never be possible to bring over a [the world's only airworthy] Sea Vixen, a "North American B-17" or a Hansa Jet [of which none have been flying for years].
Notwithstanding the fact that the Avanti is Italian (and where turbulent airflow from airframe parts in front of the propellers definitely also contribute to its noise level), what is happening in SMO has already been part of daily life in Europe for decades, and to some extent also proves how blissfully ignorant and oblivious US GA manufacturers have been for years as far as noise is concerned (and to some extent still are, cf. e.g. a Cirrus SR22....)