Wel lads as above put on my hybrid td04 kit and I don't think think my dump valve sounds the same. I am just running 0.6 boost and am using hsk ssq dump valve, I just meashed the turbo for now. but I had an air filter on my ct9 hybrid kit. Sounds like chatter from turbo when I let off, am I not running enough boost to set off dv or is it because turbo is meshed.