Im in the middle of installing my cattman and there is a perfectly round hole in the midpipe next to the large and very small tubes that the crank case vent etc. plugs into, what the heck is it for? I cant find anything that goes to it. I called Cattman but they said to email them and I might get a reply in like 2hrs but I need the car sooner than that..please help

 

Thats probably for the air intake temp sensor.

 

I answered you in General.. please try to post the same question only once..