i installed the downpipe and everything was fine...my CEL came on after 150 miles..so i did what otter posted with the spark plug anti-foulers...my light came on again and i followed the how-to so my question is...what did i do wrong

 

Did you put the defoulers on the proper O2 sensor? It should go on the second O2 sensor (on the mid-pipe) not the first sensor on the DP.

 

yea i figured it out i re read the how to forum...i saw put it on the 2nd o2 sensor..thx though