Hello, Navair. (Navy flyer?)
That little 4-cyl in the YouTube video still sounds wrong to me.
There are exhaust design tricks that can help a 4-banger. Two into one back into two is a method (Dunstall) that sounded great on the Norton 750 back in the old days. Unequal header lengths can do neat things to sound as well. But, as you said, four is not six no matter what.
Cheers,
Dave
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2004 Boxster S
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