The HKS is a pull type BOV as opposed to a push type like all of the other BOV's. By design it cannot leak at high boost or at idle/off throttle.This is most important on car's that use a MAF meter, as it will minimize the poor driveability characteristics from venting metered air to atmosphere (HKS does have a recirculation adapter availble now though!) The Blitz DD is a very nice choice as well if you want something that not nearly as many people have.
I am using a Greddy Type-S right now, I realy like the sound but it leaks.
Hua, there is a reason the HKS is popular. Oh and if you wait to hear Howards BOV, you will probably only have one chance if you weren't out last weekend....he only drives the car like twice a year. tongue.gif
EvilEvo, if I read correctly on that other board your car came with 3" exhaust piping, so I don't know how much of a gain you would see with an exhaust.