i just put headers on and had to splice the 02 sensors , they are now giving me grief. Did you have to splice or do you know of a part number that have longer wire length.
i also had melting issues on both sides behind the fender and firewall, the black plastic that is under the fender vents. this only happened on the track and was good while driving normal, i also added the heat shield product from the viper store to prevent higher heat on the side sills. This may have contributed to the build up of head due to restricted air movement.