Subaru Enthusiasts Car Club of the Sierras - View Single Post

cody · 2007-04-10, 12:24 PM

Going back to stock is always an option, but if you have a MY04 or later WRX or STi, running catless without engine management can be pretty hard on the car due to a delayed closed loop/open loop transition with the ECU...plus in any year, you really don't see half the gains as you would if you got EM.

There's two CEL's you might be seeing. One's from an EGT in the UpPipe and the other's from the O2 in the MidPipe. Again, I'm assuming you have a turbo Subaru. The UP fix is a resistor and the best midpipe fix is a spark plug adapter thing that pulls the O2 sensor out of the hole a bit. I *think* that doing both and resetting your ECU...and then driving around for a few days would get you through the OBDII scan. They don't do a sniffer test in Truckee?

2007-04-10, 12:24 PM	#3
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	Going back to stock is always an option, but if you have a MY04 or later WRX or STi, running catless without engine management can be pretty hard on the car due to a delayed closed loop/open loop transition with the ECU...plus in any year, you really don't see half the gains as you would if you got EM. There's two CEL's you might be seeing. One's from an EGT in the UpPipe and the other's from the O2 in the MidPipe. Again, I'm assuming you have a turbo Subaru. The UP fix is a resistor and the best midpipe fix is a spark plug adapter thing that pulls the O2 sensor out of the hole a bit. I think that doing both and resetting your ECU...and then driving around for a few days would get you through the OBDII scan. They don't do a sniffer test in Truckee?