^that's kind of funny because my test pipe was not the cause of my p0300 code issue at all.....i was running stock exhuast when I had my problem, since the install of my exhuast, I have no random misfire issues, and I have the CEL fix for the testpipe......the cause of the random misfire issue on 03 and some 04 evo's is caused my an overly sensative cam angle sensor which detects a knock from a weird harmonic that comes from the transmission....read above or go onto Evom.net as you suggested to find out all about this lovely gremlin!
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