I have an 03 track ed. and I'm replacing the cats w/ resonators (sort of home made resonated test pipes). the resonators come with O2 sensor ports, do I need to do the non-fouler fix when I install? I thought i read somewhere that the 03's wont have this problem but I don't want to take any chances...

 

May as well. Instead of risking the annoying SES light, go ahead and use the non-foulers. It can't hurt.

 

My 06 had the CEL come on...I reset the ECU and it never came back on.

 

what kind of code will the test pipe produce?

 

90% of 03's dont throw CEL's for 02 sensors. You should be fine, I had test-pipes for over 30K miles, and I NEVER threw a code.

The code would besome sort of catalytic converter inneficiency...

 

will resetting my ECU do anything to adjust my AFR? wishful thinking

 

No...

 

just as alberto said....you also might want to put them on anyway because without the cats you'll be getting so much carbon buildup you don't want to have it build up on the sensors as easy. imo it's worth the extra bucks just to protect the sensors