ok i just finished my stage 4 mods on my O3 wrx, and everything went fine for a while and then i started to get a rear 02 sensor cel but i knew i installed the cel fix so i just reset my ecu and everything was fine but now it comes on like every 60 miles and i am starting to feel signifigant power loss all throughout the rev range !Cry! and i was wondering if any one had any sugestions on how to fix this mess.
Have you checked for exhaust leaks? Blown gaskets before the turbo will definatly make that happen.
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