ok, here's what I'm gettin' at...
Under heavy acceleration, the VX sounds good. But if I'm just coming off idle, say just doin' 5 mph, the engine is quite loud. (not exhaust) It's as if you are holding a stethescope up to it and you can hear the internal workings.
I'm just tryin' to figure out if other VX owners hear this with theirs. I have owned probably 15 vehicles plus I worked in body shops for over 20 years, so I've heard my share of engines... just not this one.

I really appreciate those who responded with some tech regarding the main difference between the low compression (the VX) and high compression (the 350Z) enigines.

Since I've been made aware that there are no simple performance mods, I'll just drive it as is... worry about more power if/when engine goes kaput.