Join Date: Oct 2007
Location: As far away from mankind as I can get
That's an O2 sensor which feeds the ECU info to regulate the A/F ratio. I don't know if it's required in your upgraded situation but if so the "bung" is threaded with an 18 mm hole and is a standard fitting readily available to be welded onto your Ti link pipe. Small potatoes this one.
I got mine. Boy do I ever got mine.