to install an offroad midpipe, do you need to have a tuner, or can u just buy the simulators for the sensors (o2 i think?)

 

I wouldnt think a tune would be necessary.

 

you can do just mil eliminators. if you have a tuner you don't need them.

 

a tuner to shut off the 02 sensors.

 

yep the tuner can shut the rear off.

 

yeah tuner can just turn the rear o2's off

 

I ran my car around for a week after installing the o/r h pipe before sending my tuner back to Brent. He turned off the O2 sensors and tweeked the tune a bit. Along with not having the service engine soon light on, the car does run a little bit better now. From my experience, I would recommend having your tuner tweeked for the off road pipe.
Oh, you may want to invest in some ear plugs........Your neighbors are gonna need them.