One comment before I repress this thread's existence: technically, our cars do not have a blow-off valve. A BOV is opened by pressure only. It's a boost-restriction device. Period. We have a compressor bypass valve or diverter valve, both of which are at least partially opened by vacuum. It's a CBV when it opens during spool-up; it's a DV when it opens during a shift. Some people do make the distinction that a CBV is only opened by vacuum while a DV is opened by a combination of vacuum above and pressure below, but that's not (yet) universal labeling.

 

If you can't your factory bov you should get the ETS cold air intake which will move your bov to the front of the engine bay...you'll never have a problem finding it again