I got one of those eBay exhaust to replace my broken and rotted stock one on my 98 d motor. I only has a test pipe and no catyl converter, if you run no cat on an obdII motor would it have any harmfull effects on the motor, like screwing up the air/fuel ratio?(rich or lean) Thanks

 

Is there a spot for the second O2 sensor? Chances are it might.

 

I don't think so as long as you get the o2 no foulers by Hella theres a thread around here somewere that links to Evoforums about all the info i'll see if i can find it

 

no it shouldn't really. the cat is only for emissions.
as long as you still have the first o2 you should be ok. the first one is the one that checks out how well the the engine is performing, the a/f ratio and so forth.
the secondary o2 is just for making sure the cat works that is all. but it might throw codes anyways.

 

you'll be okay. a lot of people replace their cat with a test pipe for extra hp, deeper sound, etc etc..

 

Yea there is a spot for both sensors, one on the header and the others on the lower end of the header/downpipe. It seems I should be ok with this setup.

 

I used the the ebay test pipe on my 97 dx and made sure both o2 sensors were hooked up. I had no problems. Car ran fine with no cels.

 

Yea im using it now and theres no cel either, i just wanted to know if there was any harmful effects of not running a cat on the motor.

 

you will be fine.