You too can mimic the sequential bov setup. Use the GReddy Type S and the stock BOV and you have one for low boost and one for high boost. I don't think the stock BOV can handle high boost well (FCD+ psi). If you are fluttering and running 12 psi or so, you have the spring set too hard. Back off. There is no reason for this, other than you think it sounds cool. Is it worth a turbo? Repeated compressor surge will eventually cause something to fail.