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Hi Z's...... Already install headers on my 04 Touring. Everything is ok except that the Check Engine lamp on gauges turn on. I also install the test pipes with the long adapters to move out the sensors. Whats the next step to go? Thanks.
When I installed my high flow cats, I broke the 02 sensor taking it out of the stock cat. I had to hammer down the heat shield around the sensor on the stock cat because I was using a wrench to remove the sensor. I either hit the sensor on accident and broke it, or the impact around the sensor broke it. After I replaced the 02 sensor, the light went away. Might be your problem if you were being lazy and didn't want to get the right tool too. lol