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R2D2 needs a large diamater vacuum line, dedicated from the TB.
the piston is machine fit and metal. it will stick if not used or if there is condensation that enters the system (will always happen)
go back to the SSQV for reliablity and no compressor surge. or depress that piston, run the biggest vacuum line you can find and learn to deal with adjusting it for how much boost you want to run....
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