first of all a greddy bov is a completely different tpye of release than a hks, second of all any BRAND new greddy RS is set to all the way loose from the factory, its clearly stated in the instructions and i can quote it if you would like, moreover the screw is the help adjust for idle of the car if it is stalling when shifting, and MOST of all i am not experiencing compressor surge! the bov stays open but makes a NOTICABLY different type of sound than the other greddy bov's, this thread was started bc i wanted to hear feedback from people who have the RS