Hi, I just bought my 02 wrx today, and the CEL came on with the code P0546, high EGT. Everything's stock except for the exhaust(skunk2) and the intercooler (greddy). The previous owner also said it needs a top 02 sensor, would this have an effect on the EGT? I bought the resistors for the mod, but how would I go about doing this? I am new to Subarus and any help would be much appreciated. Thanks!