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    80 Regal sport coupe blow though conversion

    Hello everyone, I'm new to the forum. I bought a 1980 Buick Regal Sport Coupe a few years back. engine runs good, lots of work done. 15 psi of boost on premium fuel. audible knock if I get past 15 psi. this draw-though system seems to be alright if you just want a fun car for the weekend. but...
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