Quote Originally Posted by patch697 View Post
I would strongly advise against trying to drill & tape directly into the dump pipe itself.
The Autometer pyro includes a ceramic washer and steel hose clamp setup to allow the probe to be drilled into the dump pipe without the need for a bung. 1/4" (6mm) hole is all that was needed when I installed mine this way, and I can't detect any exhaust leakage around the probe.