[Ol boy]

I have an 89 dodge. I have put in an order for headers. The exhaust manifolds on my engine has the O2 coming off the first cylinder. I will modify the headers to fit the 02 sensor just like the stock. A muffler shop may be able to make sure everything is done right. All you have to is modify it where the O2 sensor screws in and seals fine. I also am adding cherry bomb mufflers. Honestly, I removed the catalyst because I didn't need because the sensor is before the catalyst. You may not want to do that though.