I was just wondering how much of a difference it would make if I put the probe into by b-pipe? I have the budget b-pipe and it already has a bung in it. I know one of the common places is where the pipes come together in the y-pipe, so I just wanted to ask.

 

the B-pipe seems too far back in the exhaust stream...readings won't be accurate for monitoring purposes. most of the time(if not all the time) you want EGT readings to be collected BEFORE the turbo or close to the head(if not even on a particular manifold runner)