You need to research flutter and surge before making a statement like that. Flutter/surge at WOT is what you want to avoid. Everything else that people think is flutter/surge is fine. There is a huge difference between the two.

You can hear flutter/surge when it happens.

I'm not sure what u mean by what everyone else thinks is flutter/surge is fine.
I know it's bad at WOT.

Slight flutter/surge (adible) between light shifts is normal. I have heard it with TT kits and ST kits. Nothing to worry about with that. That is all I am saying....it is not all simply a bad thing.

Here is a good writeup...

[Writeup] BOV flutter and Compressor surge - Genesis Forum: GenCoupe Hyundai Genesis Forums

well wht i am trying to say is i have no compressor surge or flutter of any kind , its just the wooosh sound is not that strong at all compared to the same set up of the other z (gtm stage1) vs (greddy kit) , only difference is gtm has their bov as seen in the pic one bov on the upper left side(hot) and one on the lower right side (cold) compared to greddy we welded both bov's on lower left and lower right pipes, and after ive spoken to tial,greddy and others they said installing one bov or both which they dont advise on the hot side will give u the loud wooosh , thats why i am leaning in welding out one bov back on the upper pipe as seen in the pic and leave one as is on the lower and share with you the difference, but before i do that i figured to see wht u guys think .