I decided to install the Borla exhaust I got so I went to take my stock exhaust off and I ran into a problem. I got the bolts off easy enough, but I could get the sensor off of the exhaust. I couldn't get a good look at how it was fastended because I was laying under the truck, but it looks almost like they are riveted on. I tried using a socket, but I could get them to come off. How do yo uget the sensor off the exhaust pipe?