Finally finished my supersprint header/midpipe cat delete install. Now producing no CEL after a few days of trying to figure out the original O2 sensor configuration. If anyone does this, make sure to mark during removal whether it is bank 1 or 2 and upstream or downstream otherwise it will shoot off with CEL after CEL for multiple cylinder misfires. She now sounds great feeding into the Remus mufflers and pulls harder with a nice burble when letting off the throttle.