I just ordered a MAK offroad pipe.Question is-I see the bungs are there for the O2 censors.But do i have to shut them off or will they work fine with no cats?I am worried about the CEL coming on.

 

They should work fine. Thats why the holes are there for the O2's. Good luck

 

The SES will indeed come on. You can use MIL elminators to stop it.

 

Only if your car is reading out of specs, I am sure there is wide variance there, as I put on competition cat converters, xpipe, and axle backs, and have had no problem. The sensors sense the richness, leaness of car at that point, and make computer adjustments if necessary. The only thing the cat does is try to burn off any unused gases. I really doubt cel will come on. If O2 sensors arent plugged into get a richness or leaness reading they will go off. But as it is in the exhaust stream it will read. If you have them unplugged you need the MIL's.

Here is the link. But these are usually used when the pipes dont have threaded holes, or way out of spec.

http://www.rpmoutlet.com/gmo2s.htm

Good luck. Either way not a big deal. I am sure you can probably find these locally as well. So I would first try without them. Try to save a few bucks.

 

Can't you use the Excalibrator to turn them off so NO CEL

 

I have Bassani high flow cats which are very close to off road strait throughs and the CEL has not come on. I have been running them for a month now. Hope that helps.

 

If the pipe uses "high-flow" cats, you should not have a problem with the CEL coming on. With an offroad pipe, you WILL have the CEL come on (usually within about 100 miles). You can turn the rear 02 sensors off via MIL eliminators or your Predator. There should be a setting in your Predator to "disable rear 02 sensors". Good luck.