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They serve as "mufflers". There should, I believe, be insulation packing around them as well.
I made the mistake of repairing the sills and longitudinals on my '72 and replacing those tube with a solid piece of DOM tubing. Bad idea, take it from me. Running the heat now results in a big increase in interior noise. Not enough to cut them open and redo it, but I really wish I had used the OEM solution.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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