i currently have the standard silver high frequency noise insert on my hks ssq bov.....i am interested in a lwoer frequency which i guess you get from the round purple insert......doies anyone have this on there car and want to share how it sounds.....is it great? lol

 

I have heard one about a week ago at a car show, it sounded preety good, not as high pitched as what your current one is...I'd give it a try. Not harsh, but a nice sound.