I had this exact same issue when installing my HFC's. I will be posting an install thread with my thoughts from the past month of having gen 3's, berk HFC, and Stillen CBE. As well as the pics of the stripped bolt. It was a PITA and took over an hour just to remove both HFC's due to those stubborn top bolts. I haven't read the whole thread but i hope you find a solution soon.
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09 PG 370z 6MT Base - Stillen Gen 3's, Berk HFC's and Stillen CBE
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