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Welcome to the forum, Scooter.
As others have said, the thermal reactors have been replaced with collector pipes. As to when, who knows. Something else I notice is that the muffler doesn't have the EGR supply pipe; am guessing either the muffler was replaced at some point or that 911 didn't come with EGR.
Definitely spring for a PPI (pre-purchase inspection) by someone familiar with 911's.
The bottom of that motor looks to be in better shape than my 2.7 did when I acquired it. I was advised to drop the 2.7 and find a later model motor to install. Some days I wish I had done just that (would have had the car on the road a few years earlier). Instead I rebuilt the 2.7 and it's a great motor - revs all day and really likes it. It was expensive - and I think worth it (most days...).
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