[Jakey]

From what I understand, the benefit to placing the probe in the #2 runner is going to be the monitor cylinder that is most volatile to potential issues. As for tapping on the underside of the manifold it comes down to one reason in my eyes: appearance. I may end up purchasing the stainless heat shield from JM Fabrications so the last thing I'll want to do is drill a hole through it for running my probe wire.