This week I am going to install a test pipe (no cats). Do I need to do anything with my o2 sensor or will it be fine. I have a 95 sc300.

Thanks

 

I installed a race header with full exhaust on my little brother's SC. So its been running with out cats for a couple months now on some new Os sensors. We havent had any problems. I dont think you should be experiencing any problems unless your O2 sensors are super old. Also if your cats look like their are bad from running rich you will be puffing a little bit of smoke at complete stops.