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I switched to 16v and i bought the low pressure spring. My regulators on motor and my systems seem to be holding fine does the spring still need to be changed?
 

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What exactly do you drill? Size?
You drill the poppet in the bottom of the bypass the brass piece and i drill mine to 19/64 one size below 5/16 and told Magnafuel what i was doing and they told me it wouldn't work but 6 yrs later and 3 cars all done the same way spraying 3 and 4 foggers pump pressure always looked great on the Racepak. Before i did this it didnt look great at all on the graphs before the nitrous was applied but the spring may be better but a very well known nitrous racer and tuner does exactly the same thing.
 

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It may or may not work for you. I had to drill mine as well. But Robbie had me drill the end of the bypass, where the flare goes into your bypass hose. I think it is about 5/16" and I drilled it to 3/8" if I am not mistaken.
 

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Magnafuel told me to drill the bypass to 3/8" at the flare end to get pressure to set at 22psi before my fuel log on 16 volts and it has worked fine. Before I drilled it it would not go down past 30psi.
 

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It may or may not work for you. I had to drill mine as well. But Robbie had me drill the end of the bypass, where the flare goes into your bypass hose. I think it is about 5/16" and I drilled it to 3/8" if I am not mistaken.
X2
 

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any one have a pic of a drilled poppet
 
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