[91 turbo]

Is there any advantage in upgrading the bov. If all I wanted was noise I would vent the original to Atmospere. Is there any power gains??

 

[BDSL]

There will be no power gain. In fact, another other BOV beside the OEM one will get rough idling and/or stalling.

 

[MRQtwinturbo]

this question comes up every other week.........

http://www.toyotanation.com/forum/t40045.html

 

[Piddy]

Even blowing your stock BOV into the atmosphere will screw up your performance. Your car will inject extra fuel and not have any returning air to match it. Your A/F ratios will get all screwed up. It's best to just stay stock. Plus... you get better gas mileage.