Hey BallZ33, this is the same Wilhelm from zcarmotoring btw, but any test pipes will throw a CEL if you don't take the right precautions. I have one of these installed on my Z with 2 sets of sparkplug nonfoulers and a set of AMS O2 sensor spacers. I've never thrown an O2 sensor CEL and I have headers too.

 

or have a 2003 or 2004, they are way less sensitive to O2 feedback

 

If you still have this is a couple of weeks, perhaps I'll take it off your hands.

 

SOLD