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Discussion Starter · #1 ·
I have a HDI duel stage boost controller in my wrx, was already in the car when I bought it. The problem I have with it is that when I try to switch it from low to hi or hi to low boost it doesn't always work only every now and then. My question is are these components prone to failing or is it a wiring issue etc, any input would be appreciated.
 

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· Not a mod... or is he? Or, is he not?
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Then you 100% shouldn't be driving it until you know, and you should go get it tuned anyway as well as a leak down test done.

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