I'm sure others way more qualified than I will chime in, but...b/c it is where the front TB mounts it very well may be an issue..
Consider the commonality that once you actually see the rust, there is usually much more cancer that hasn't eatin thru the undercoating..
Why chance it? It is a safty issue b/c where it's located..you (hopefully don't) could lose control..even just street driving w/hard cornering..
IMHO get it fixed ASAP
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Former Test driver & Production Manager Singer Vehicle Design
2009 Cayenne GTS, '81 911SC RoW Targa (lot's of goodies), '86 535csi, '84 633 csi (turbo charged-sold)  , '68 912 Targa (sold)  , '69 911E (sold)
"Dream it, Believe it, Decide it, DO it "
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