Hi Guys, I'm hoping I can get an answer here about my BOV problem. I have a 2010 FX SHO with Riva Stage 1 mods. I also have a Riva BOV, I bought used from a forum member 50 hrs on it,it also has the purple valve in it. I don't hear it blowing off, so I'm assuming that it is broken. Any ideas on what may be going on? Thanks in advance.