The rear attenuator on the Penske cars has been modified for a long time as seen in this photo from last years Indy 500.

I dug into Dallara technical documentation to learn more about it and wrote about what it all means for @motorsport-com.bsky.social:

https://www.motorsport.com/indycar/news/penskes-modifications-arent-the-actual-problem-the-fact-that-no-one-caught-them-is/10724722/
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