This might be heresy but I really don't see the point in getting a new BOV that sounds louder, slow release, with trumpets etc.
They all do they same thing, they either work or they don't. They just make different wanker noises.
I don't think I'll ever get rid of this basic HKS bov as it's loud enough as it is... and $563!!!
Buy something worthwhile like an AFC or EBC.
Pic is off Nengun. How much is it worth btw?
T.