Just thought I would throw this out there. Bought the Pulse Exhaust Manifold from HTT. Advertisement says drilled and tapped for pyrometer. The two holes in the manifold are 1/8" NPT. I've had two different pyrometers and both were 1/4" NPT. Called HTT and their only response was "We've never had that come up before". No offers of a solution just "DUH". I took it to a machine shop and spent another $35 to have one of the holes enlarged to 1/4". Could've done it myself but after spending $425. 00 for the manifold thought it was better done by the machine shop. Guess I'll reconsider my purchase of an HTB2.