Don't mix VQ30DE and VQ35DE.
the first vid sound like a VQ30DE. Also VQ30 are known to sound like porsche h6 @ low rpm; cheap rattle sound.
VQ35De are totally an other story, nissan put ton of cash for sound r&d. On car forums, VR6 and VQ35DE/VQ35HR are always top 2 for best sounding commercial V6s.
imo the best sound in any built will require :
- straight muffler with acoustic wool
- huge resonator (20 to 24'' long)
- calculated helmholtz resonator
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