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Hey im pretty new to the turbo game and i got a 1990 supra turbo and im planning on installing a aftermarket blow off valve and i wanted to know where the stock one is located. And if i put a aftermarket bov with the stock one still on what would be the problem with both installed


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The stock one is located above the exhaust side cam cover near the front of the engine. There is a hose running from the 3000 pipe to it, and there should be a vacuum line to and from it as well.

You can run both without any more trouble than you might have with the aftermarket one. Remember, the Supra uses the AFM to determine the fuel to give the engine, and is not expecting a purge. When the aftermarket valve purges, you may experience everything from back fire through to stalling out depending on when you take your foot off the gas.
 
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