Ive just fitted my apexi bov and i cant seem to adjust it, when i do adjust the screw at the top, which must be the spring tension, nothing really changes, same as the red ring that changes the hole size, the sound stays the same, i was hopeing it woud change. ive also had it apart, and its all ok inside, all moves ok Can any one help It just sounds like a quieter blitz bov, which is what ive just taken off Thanks Jack