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Discussion Starter #1
is it necessary to upgrade the bypass/bov on a 93 bpu supra? if so which ones do you guys recommend going with? thanks.
 

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The stocker is good for BPU....unless it is old & leaky, then replace it.
 

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Boost4fun
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From that point on I would rather go aftermarket, speak: bigger. I wouldn´t be worried about the PSIs but the airflow. Boost will not be much higher than with the twins on, maybe even lower...
But if you look to the channels of the OEM valve you´ll see how small they actually are..
 
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