Quote:
Originally Posted by s13eater
twin piston dump valve does'nt upset the ecu though, the idle goes up and down on normal valves, or you can put a one way valve into the vaccum line, i think you t off, its like the little valves on the mk2 washer jets, that sorts it out. 
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does upset things if you have an AFM. You'll get very rich fueling on gearchanges, which will cause hesitation and possible misfires