I just had my Greddy exhuast installed and I had no CEL for about 80miles. I then installed my piggyback and after about 15miles my CEL turned on. With both installs I had RRM's testpipe on. IMO, even though my CEL didn't come on when I had the testpipe, intake, and exhaust, I think the cause of my CEL is the testpipe.
Any suggestions?
One more other thing I installed the the piggyback perfectly(using RRM's instructions), plus, I have a feeling I installed it perfectly because my car idled high and the beginning and my car never tried to turn off on me and my idle isn't loopy. My car is running well.

 

CEL came on after i installed the ecu.

 

anyone else

 

bump for some responses

 

no one else had this problem????????????

 

did you guys get your codes pulled?

 

I didn't. Do you think the CEL is on because of my testpipe? Should I pull the code?

 

a rrm or kamikaze header will activate a code. look in the evo "how to" forum for a mechanical o2 fix involving sparkplug anti-foulers.... if that doesn't fix anything, go get the codes pulled.

EDIT: I'm retarded. a test pipe shouldn't pull a code if you've got a o2 sensor installed into it.