i bought one for my r32 gtst,
everything bolts in perfect....looks good, no dramas but expensive at about $400 for the kit.
Stock BOV sounds loud and induction noise is loud too.
I felt it made a difference at higher boost levels due to the rubber pipe slightly caving in. With an enclosed box and Cold air intake, i think it would be very good, but so would the stock box with a steel pipe and decent cold intake.
I've got it sitting in a box right next to me because of an up comming emmisions test.
more than happy to take photos for you.