I've heard upwards of 15psi definetly, b/c 14psi maxes out the stock size. I think it was MDC that said that you really cant push those but to a certain extent, b/c the housing itself cannot support really high pressures b/c of surging problems/ it pushes it out of its efficiency island. IMO i...
The one idea i had a while back was, taking my DMM and probing the knock sensor wires and reading it that way. But i dont know how accurate it would be?
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