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In my personal experience when dealing with a WRX, it is optimal to place the probe in the passenger side exhaust manifold. This is going to give you an accurate enough reading to refer off of to how your car is running. Tuning off of an EGT gauge alone is never recommended. WRXs I tend to look for 700-800 (1400-1600) degrees. Going no higher than 850-900. This is only a reference point as I mentioned already. I was doing some road tuning with my WRX, and the EGTs were "safe" but AFRs indicated otherwise. My AFR was 11.8 - 12.2: 1, and on pump gas, WRXs do not like that and are inconsistent between fill-ups. When going WOT with my probe in the passenger side manifold, I saw EGT readings of 750-800 MAX with my GReddy gauge.
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That was from a friend of mine that used to build stroker motors for the WRX. He also continued to say that the injector #3 "pressure" problem has since been fixed, being that it's only an early wrx condition.
In any event, you monitor your EGT's for a CHANGE in temp ONLY. So, if you even go as so far as in putting it in the TIP of your exhaust and your temp is rising, there's a problem.