I went to autozone as soon as the "check engine" light came on. They hooked up the scanner an got the code you see above. Now, i have a OBX header that we had to modify the o2 sensor harness to reach (basically spliced), and I have a Megan muffler. Everything else is stock. I have had to take my car into the dealership for the pre-cat o2 sensor before, and they supposedly fixed it by putting on a new one.

O2 Sensor Circuit Slow Response (Bank 1 Sensor 1) is what I got from the code
you recieved....

Well....i dont have a pacesetter header or any header for that matter....but i hear that you should not extend the stock o2 wire......which in turn will give you slow response.....

dont worry bout it..i have had my exhaust for a year now and it does that off and on just do to weather services..i even replaced the sensor and came on a month later..just dont worry bout it..it shuts off on its own.