While the original photo is an April Fools joke, there are a lot of real ones out there! This approach is fairly common at sound restricted race tracks like Laguna Seca. Do a search on "Laguna exhaust" and you'll find many more examples...
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor