cap it, dont use the horn. It might help, otherwise PM hameedosh - He has tan evo x with the same issue that he resolved.. U might have to loosten the knob a lil bit.. try that also. Used the AP bov for a few weeks and then got the APS.

 

^^ Agreed. Convert it to full recirculating an see if that helps anything.

 

okay guys im going to first loosen the spring a bit then if that dont work im going to cap it n see hwta the outcome is....if i have to cap the dayum thing im just going to get my money back cuz there really is no point....kinda sorry i sold my evo9 bov now....

could i ask you guys another question....How can you tell you need to tighten or loosen the bov? as far as the way it sounds...