Question...with an offroad exhaust,would there be any gain in turning off rear o2 sensors. Predator allows you to do this,just wondered if it would help boost power?

 

No gain, it just keep's the CEL off.

 

will the predator do this now?

 

Does the 05 even have rear O2 sensors? If memory serves (I was just under the car this past weekend), there are only 2 O2 sensors, each of them plugged right into the middle of each cat. I could be wrong though.

 

I would consider those rear...there are more O2 sensors ahead of the ones in the cats. I took them all out when I changed over to Bassani cats. On the driver side the first sensor is on the manifold itself and doesn't need to be removed. The first O2 sensor on the passenger side is located just after the manifold but before the stock cats.

 

There are two above also...one in exhaust manifold,other at top of h-pipe.

 

I HAD to turn my rear o2's off to keep the CEL off. I have SCT though.

 

Those are just catalyst efficiency o2 sensors. No affect on fuel metering. Just light up the CEL when your cats go bad.

 

So if I was to replace my factory H-pipe with Bassani's full x-pipe with removable cats, there would be a good chance that my check engine light would come on?

I don't want to have to buy a tuner if I'm replacing the h-pipe.