Bypass valve is mainly there to reduce emissions and popping on overrun. It has little effect on "boost between shifts". That's a job for recirculating valve (the one with piston and two rubber gaskets).
You can remove the deccel valve and plug all hoses going to it. It's one of those things that starts leaking when it gets old. You might get flames on deccel when on track (there is no deccel fuel shutoff built in K-Jet , KE-Jet has it though).
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