I'd say after 2.5-3k RPM, you will easily hear any of the intakes available for the car... slight differences between brands, but pretty much the same.
Here's my car with the Fujita (no longer installed):
http://www.youtube.com/watch?v=j0Rny1ujpcc
And with the R2c prototype:
http://www.youtube.com/watch?v=GeKXIFzemeU
Never did a stock dyno, sorry.
I don't have that high pitched rattling sound you can barely hear in the background anymore... I changed up my exhaust a bit.
But the intake still sounds the same.