I drive a GSR with t3/t4 turbo in a EF(12psi). My question is which bov makes which noise? I have a Turbo Xs RFL and im not satisfied with its sound, its not my taste, its just goes whooooosh.... Not cool, i sound like a bus lettin people off. Anyway i wanted to know which bov has the nice high pitch chirp sound? i was thinking Apex twin chamber or Greddy, but im not sure. can i get some help? Ive only had by turbo install with the Bov for about 700miles and i would like to trade things up with someone if i can or if anyone would like to..... anyways can u guys help?