Originally Posted by KONKILR
No such thing.
We need to know what car this is on. Some subaru's can be tricked with just a rear o2 spacer. Some require the codes be deleted or a simulator be wired in.
Originally Posted by scooby_wooby
Also, go to autozone and see what CEL you got. Save some money and get a proper tune. Do shortcuts and you are asking for more problems in the future.
idk guys, IAG explained my CEL code was a result of a catless DP on an 04 STI without a proper tune. the car was rejecting cruise control and eventually threw a CEL/"Cruise" light blink at me. they explained that this was caused by a difference in backpressure that the car wasnt tuned for.
i doubt IAG lied to me to get extra $$, but theres always that possibility. anyway, after i swapped back to an OEM DP the code was cleared and there hasnt been a problem since.