No worries as you get older you won't hear as much
Have these on 3 FBI Z's
I have the prototype on my Z since i did the R&D on this with my friend Bob's connects this one is a bit louder and rattles a bit more but then i have big cams.
The other 2 are big inch LT5's w/cams same set up as yours and really not that bad, they are as if you installed Fidanza Alum flywheel.
If you have stock idle (650rpm) try raising idle a bit to 750
Pete