I think the sound comes from the engine configuration as stated previously...
Compare the Flat 4 of the 356's and that of a WRX...
Similar sound, but the WRX's is dulled (probably by the water jacket)
On a side note, The "air" cooling in a misnomer...They are "oil" cooled, and the oil is cooled by the air.
As the water is cooled by the air in "water" cooled engines.
DKGandBH
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