Indeed echo is really noticable as if driving in the tunnel.
But S397 AMG does the good job with low rev nuances and bass.
I like rawness of Simtek sound but it is too flat, lacks depth so overall S397 is better for me.
Check the S397 video from 3:48 (turn before Carousel) to 4:10 to see what I mean. Nice sound transitions and nuances in lower revs.
If only one could get rid of that echo...
...and make sounds more raw. I agree they are too soft. It is evident in corvette video
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