[Blackcrow64]

Neither is better than the other. They are just personal preference on if you would like the BOV to be louder or not. HOWEVER, if you vent atmosphere then you must be running a GM MAFT. The reason for this is because the ECU is expecting that vented air to be recirculated back into the intake. If it is not present then you will be running too rich. Some people say it affects their performance and sometimes idle, some people never notice anything with it. Regardless, the proper way to vent atmosphere is to use the GM MAFT if that is the route you would like to go. If not, then you can upgrade the BOV and just recirculate it without any other mods. The aftermarket BOV will hold more boost than the factory plastic ones which start to leak much past the stock PSI... I think I covered everything... Hope it helps.