I think the inserts are"carbonized steal".. Not sure if that makes a difference.
They are apparently made for this application and more.
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2011 Metallic Black, Touring/Sport, Nav, AT
| F.I. Twin Turbo #060 | E85 | F.I. Built 7AT | F.I. Flex Plate | F.I. 34 Row Oil Cooler | F.I. 19 Row 7AT Cooler | ECUTEK Tuned By Sebastian | 647 WHP 605 TQ | 
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