dump valve

Head is wrecked trying to get or decide on what dump valve to get. At the moment I’ve the standard BOV and it has a great wooooosh sound and love it but it’s not sensitive enough. Wondering what people would recommend? I don’t want any high pitched annoying noise.

as above, what's the best..? i just took one apart and want to piece it back together soon..

i have a blitz ss blow off vale and need fitting instructions. i no its pretty straight forwrd jst wondering if anyone has any photos or instruction manual in english. if anyone could help or point me in the right direction would b much appreciated. milo glanza v